No help after service had been suspended no billing department

Your account is in arrears for 6 months they don't complain you pay the R800 for internet and theys still switch you off you phone then the entire day and being told you are still owning money. When you phone the billing department you cannot get through to them and being told you cannot reach them. Hold on for 20 min at a time to make arrangements for payment and still no success. Such bad service when it comes to billing department. The tech even arranged for a call back an entire day after 9 calls and still no success with the billing department even considering of getting another service provider