Self service, for multichoice on your account

I had the payment plan, every now and again problems with serviceb being suspended. Telling me the account is 1 year in arrears with R660 or something. As usual a billing or statement fault on multichoice's side wich i had to resolve for them to have my service back. I credited my box office account on the 3 des with R100. Watched 1 movie. Today the 4 Fed2018 I try renting and my account it's empty. Phone in. Sorry it was used for the payment plan account. After I pay more than the R899 witch is required each month, but my account is always in arrears. This is it!!! Had enough. The customer service agent asks me to forward the statement for Jan to her that I already downloaded from the self service app,because her last payment showing is for Dec 2017. But Jan's statement shows the account in a credit of R101.00. Please help me!! And please help multichoice, nobody can deal with this incompetend company and employees.