DSTV cannot effect debit orders properly

This is the second time I phoned in since the debit order that went of my account on 2015/08/25. DSTV debited my account on 25/08/2015 with R149 in stead of the normal R800+ amount. I phoned in and DSTV could not verify the a mount of R149 they have debited. I then made an additional payment of R730 which I had to help the call centre agent to calculate. When I phoned in today the agent wanted to transfer me to another department with resolving my matter. DSTV never phones back, they never give the right answer, they never go the extra mile for me and I am the fool that still ends up paying them month in and month out. Please would someone assist me with this problem.