I was always a beleiver that you ring the company direct if you suspect something is wrong in (say) an email. Well, that golden rule is now bullshit.
This is what happened to me : I rang Microsoft to get help with a Word problem - I gave them control of my computer like I have done many times before - he said he needs $7.50 to fix the problem - I was sick of the problem and gave him my credit card details (like you do) - the next minute my wife got a call from our bank who asked if we were in India and spending $750 - they cancelled the credit card immediately but the fucking pricks got $750 - I rang Microsoft on another number and they said "oh yeah that happens on that number" - I rang the bank and they refused to refund our money because I had given out my credit card details.
So, the golden rule (ring the company direct) is fucked.
When someone takes over somebody elses phone number its called "porting" and its not unusual.
It knocks your trust of things around and never did like curry.
I have had the bad luck constantly non stop been in trouble with tricksters and crooks .The good side on that is that I have gotten good at dealing with crooks
Now Firstly I have no Extensive Legal Education or Exam
Secondly Rules may be different in other countries
Third this is a Quick first shot on short info
Now you have contacted a service supplier to getting help with a problem -- Normal actions Well known company.
might even be the best known in the world.
You are asked for information Normal actions ask and leave such information.cooperation In the solution process.
You are not doing anything wrong ..IN that moment perhaps does wrong but here it is fraud as it seems.
It is not a normal behavior to leave out credit card numbers it is he asking for them.. But for 7.50 nothing else.
You are acting in a normal manner Leaving the Facts to the person asking for facts ----Where these facts later end up is dependent on his Fraud or his systems functionality.
Rules differ and I don't know how it is in other parts of the world but here telephone conversations are recorded .with fex the bank so should problems arise the tape can be played .And it is also so with videotapes.
So if there is such a tape I would ask to get that .
And I would say I have done according to Your Instructions ( Best case with the recording )
I have never admitted to any actions in India that is your outsourced or whatnot BS department in Bangalore or BongoBongo land that is transactions you have the Responsibility for. Our agreement was 7.50 nothing else.
Now again depending on what you have accepted But here I would call back asking for such an Tape ..Going past the " Dumb ass " they have as first defense line Teenager with a paper instruction..
Then with the senior person at the other end explain that the talk was on 7.50 never 750
And this being an Big company there is a fair chance that he looks into it which is Normal .. Shit happens and with cooperation they gets solved.
He should have a day or halt week on him.
He can be in the position having criminals in his staff which is something he wants to know.
He has the possibility to file a Police report and you can tell him that you are thinking about contact the Police.
Here the Police would not fix it but I have heard of Stricter enforcement in the US can it be Mail Fraud
And Australian police does have the reputation kicking ass should there be need for that Right or Wrong. Heavy handed..
When that is under way I would contact the bank saying ..
I am a victim of fraud here and there can be Police reports filed Please have another look at the situation there can be a need for your cooperation.
It should not be possible to hack out 750 from someones credit card without ..some consent with verification. And calling your wife if it is your credit card
Is also Questionable
I give this a fair chance getting the money back --- ( of what I have seen so far ) reason being again the credit card company ..being powerful and able to act.
They sometimes pay out without investigation ..because if the word gets out fex You file a Police report. and the word gets out.
Their damage in terms of lost customers and legal hassles Police investigation --That is something tricksters and perhaps even more Banks
are very very very afraid of These days Many banks if not all have dealings with Black or Grey Money Drug money Laundering or Oligarch .. Want to continue Flying under the radar ..750 is peanuts in that context. A quick refund and move on can as I see it happen.here
Business is Business
But again take this with caution ..because Things can differ 
