account debited twice two months in arow

In September my account was debited twice with two different amounts. I called multichoice and they said they could find only one amount. So i explained the amount has gone off my account and all they could say they don't see on their side. So i had to go through the trouble of reversing with my bank. This month same thing has happened and they still can't help yesteday i was debited today again. I have to again call my bank becuase they cant see two debit order. Im so frustrated as no one seems to know whats going on.