******ionate outstanding balances

Very disappointed with the level of incompetence at DSTV , My price lock contract expired a month early and my service was cut, since then i have been bombarded with outstanding balances regarding 1 decoder that was somehow not included in my monthly debit order. Since my last debit order on the 22nd February 2019 i have made another payment of R900 as stated on the DSTV website, immediately after the payment I get an sms stating that another R760 needs to be paid, a week later this number is now at R1700. I fail to see or understand that a mistake from multichoice becomes the customers problem and that not 1 person can resolve the financing issue. I cannot be paying R4000 for 1 month of viewing where I still have to call in weekly and spend 30 minutes on each call to get this resolved. Multiple calls have been made with promises of call backs yet nobody gets back to me in an attempt to resolve the issue. All i get told is that i have to pay the outstanding balances. My question is how many times am i going to be paying outstanding balances as i pay what is stated and a few days later i have to pay again