Dstv disconnection

I have been calling Multichoice dstv complaining about the disconnection of my services. I made about 7 calls today and would be made to hold the line until my airtime gets finished. I still do not know how I got to owe R880 after paying R569 on the 18th February. I also explained the number of active decoders in my account. I presume that their customers are less important as they have no competition.