Standard Bank Mobile not giving money back for cancelled transaction

I app**** for a Cell Phone at Standard Bank Mobile. I was under die impression that this will be a budget facility on my Credit card paid off monthly.

Standard Bank mobile debited the full amount of the handset on my Credit card which resulted in my Credit Card being over limit. I immediately cancelled the phone Its been 7 days and Im still battling to get the money back.

Standard Bank Mobile was quick to take my money but takes forever to give it back