Account Query

Once again my account is such a mess with DSTV!! I have been fighting with them since August 2019 when they stuffed up my account for the first time. As I was a price lock customer and for some reason their system did not deduct our discount for being a price lock customer. Since then, every month my account was over charged and I had to reverse my debited order as they have been taking more money that what was actually due. I have phoned your call centre, the phone gets put down in my ear and I received terrible service from your offices. I then received a phone call from Amanda, that promised me my account will be sorted out. As per her e-mail to me on 20 November 2019 as was told my account has been sorted out and I will not have anymore problems. Well, not true!!!! Every month before my debit order goes off I query my account and every time there is an overdue amount on my account -WHY??? I pay per debit order and I was promised my account was sorted out - once again I query my account today, once again I have an overdue amount due on my account -WHY????? I AM SO ****ED OFF WITH DSTV. and the worst it, they are arguing with me, telling me i do owe this money!!!!! YOU OVER CHARGED ME SINCE AUGUST 2019 - I WAS INFORMED ALL CREDIT NOTES WERE PASSED!!!! UNACCEPTABLE!!!