Overcharged every month

Good day. I need to find out why I am paying between 1500 and 1300 per month for dstv. According to my statements for December, January, February and March my account have either had a credit of plus 300 or zero amount due. But still they send me messages that I must pay or will get disconnected. I just need my account to be checked for the last 6 months and recalculated. I'm sure dstv owe me money. In August 2019 I had a credit a mount of more then 1000. The next month they billed me for my full month after I told them I don't want the refund they should put it for the next month. It went missing. Apparently insurance and Xtra view and Access fees. This is not right especially now with lockdown and no income Pls I need someone to refer us to accounts department or supervisor to contact me or someone who can pls just recalculate the whole ****** account as soon as possible. ED Moos Account number ***8