Double Debit Dispute - no feedback

On the 17th of March, I was doing an online airfare purchase with British Airways, when I lost connectivity. I logged on again and proceeded with the sale. I received one E-Ticket but realised a few days later that 2 deductions had been taken off my credit card. What is so frustrating, is that on other occasions, I get an sms asking me to confirm that a few random amounts off my credit card aren't ***** and yet when TWO amounts, for EXACTLY the same amount for airfares go off, no one queries with me? I contacted Std Bank on Tuesday the 23rd and spoke to Pinkie Mabidilala. She said that I needed to fill in an SOD form, which she sent me. I completed the form and mailed to the address that was on the form- *** - I received nothing in return. I then queried with them as to whether they had received it AND cc'd Pinkie in on the mail. To this day, I have received no feedback from either party. As you can imagine, I am rather irate and would like the double debit to be reversed as a matter of urgency. Yet more poor service from Standard Bank