Unfair treated student

I am very very disappointed and angry at multichoice. Last year had upgraded in June from access to Compact of which did that over the phone and the lady never told me will have to pay a certain amount, then each and every month I paid what multichoice kept asking for but came september received an sms saying I owe +-R1500 why I did not know until I call them and they said in June was suppose to pay a certain amount which I hadn't and it had interest, I asked the lady why you guys only telling me now that why not the first month(july) and she apologised and my recorder had been disconnected so ended up paying it. Then came last year November whereby I downgraded to family and then kept on receiving sms telling me to pay more than what I should pay and I went to one of their agents here in East london and they checked and told me they will email head office and ask them to fix because they could see that been paying what am suppose to pay until today the problem still is happening. Thursday the 16th july was suppose to pay R450( family, PVR and decoder) so was only able to pay today and they had sent me an sms asking me for more than what am suppose to pay but I went and paid R500 (R450 +50) And now still they aren't able to reconnect my explora back they say I owe +-R190 which is incorrect. At the agent the lady who was helping me continued each and everytime I went there to complain to just pay my normal fee and now will have to go there again so she can recconect it for me coz call centre they say no they won't be able to do so. And this is suppose to be my last month paying for the decorder it's 24 months is up... Please Multichoice tell me what to do.