Poor service from Multicoice

We have received shocking service from Multichoice over the past few weeks. We paid for our DSTV a year in advance last year and hence, did not recall when our subscription expired, while constantly checking our mail messages to see if a reminder for payment was there. No message/ e-mail/ sms was received, and our services were cut off. We then paid R 862 on the 30th of January, as per a call centre agents instruction. A few days later, we were disconnected again, this time due to an outstanding R 50, which we then paid on the 5th of Feb. Since then we have been disconnected three times, costing us money to call the call centre (free minutes do not apply). Every time we phone the call centre we are told that it is a system error. We have asked to complain to someone and have been told a manager from DSTV will call us, which has not occurred. We have been DSTV customers for many years and feel that this service is totally unacceptable. We also feel that we have no recourse, because there is no real competition to DSTV and there is no point complaining to the call centre agents, as they are simply doing their jobs.