UNAUTHORIZED DEBIT

On 25th June 2015 my husband received a call from the sales team in Randburg, very feint line on a cellphone. He was bul**** into giving credit card details. On Friday 26th June 2015 an amount of R3 750-00 was debited to our credit card. I tried stopping it with the bank and was told this is not possible. Tried on numerous occassions to contact Randburg on *** with no luck. I then contacted Sylvia on *** and have done follow up calls. I was requested to send an e-mail, to which I got a read receipt. On contacting Sylvia again today I was informed that my e-mail was never received. I have now been fighting for 2 weeks to cancel this membership and have our money returned to no avail. Please advise and warn people of this behaviour as they are getting rich for doing nothing. No confirmation email of our membership and no card forthcoming.