WHY AM I LIABLE FOR MULTI CHOICE MISTAKE?????????????

I couldn't pay my dstv in June and the services weren't disconnected now i want to pay my account I am being told that I must pay R800 because multi choice did not pick up that my services were active and i should have called.since when do we have to call for them to disconnect if you did not pay?they normally switch off your services after 3 days if you did not pay so this time around they did not pick it up and it now my problem.where the hell am i going to get money for airtime to call if i cant even pay my account does that make any sense?it is multi choice problem that they did not disconnect the services why now am i liable for your mistake.even the supervisor and consultants i spoke to did agree that it was multi choice mistake they did not pick it up. :(