Dstv Poor customer service

I have been overcharged by multichoice for over 3 months now and it means even for this month they going to deduct more since no one is willing to help me. i called them several times and at some point holding for more than 30 munutes with my own airtime but still i am still not been assisted.

i am on DSTV price lock for R499 but for the past months they have been deducting more on my account R759 for end April, R634 for May and this might continues this month. On the 14 of may i spoke to Thomas from their call center he promised that i will be refunded within two business days but it never happened. i called again on the 27th May and i was told my case is sitting with finance, i asked for how long and the lady told me she cant tell. i am tired of their lies can someone please help.