Billing

MTN billing is a mess. They forgot to deduct from my account last year and my monthly fee is R500 and now they send me an sms saying I owe R1000 and I asked who is a fault as there was money in my account where do they think I get the R1000, but I ended up making an arrangement to pay the money. Then in January they deduct R300 and I thought maybe I over paid due to the arrangement and now they show up saying I owe R1200 from what no they deducted R300 in January who is at fault here. I call asked for another arrangement as I cannot afford the R1200 and told the agent they must deduct R600 and I want to speak to the supervisor so they can fix this billing . No one contacted me and no money was deducted then I get an sms saying my account will be suspended if I don't pay the R1200. I call again trying to fix this and the Agent was rude saying the money has been bouncing and I asked her check you records not a single month have I not paid MTN she has no right to tell me about my account I asked for a supervisor again and my call was just dropped.