Incorrect billing and clueless call centre agents

Feb 2016 was the only month we forgot to pay DSTV acc. We were cut off! I immediately went online and paid in full and services were reinstated. On 05 March paid DSTV acc-amount according to online acc. Today we get cut off. Call Multichoice. First we are told payment was reversed (it wasn't) then we were told we OVERPAID on 05 March but despite that we owe +-R350 pro rata because we paid 3 DAYS LATE???!!! Then we were given another reason along with a completely different outstanding amount. Now I go online and it says we owe 800.00 DUE TODAY even though March was paid in full and all other monthly payments are up to date!! I was assured a call from a manager at 9am which of course, we never received! Sick to death of being told we owe but no one can explain how much and FOR WHAT??? When the account has been PAID IN FULL EVERY MONTH!!!