Multichoice is useless!!!

In the month of February I downgraded my package via the robot chat as we don't watch DSTV alot, then on the 01 April they deducted way more than the package that I had and the amount were supposed to be less. On the 03 April I contacted DSTV and asked them to cancel my account with them with immediate effect which i was told before the call ended that it has been cancelled. On the 01 May today, i noticed another debit order that went off and again!!

Now they are telling me that my account is still active!! their call centre people is useless