Multi Choice Error leads to arrears

I Have received statements via email from Multi chocie showing that my account was in credit in November 2014 as well as December 2014. In January 2015 I get disconnected and told i am in R5300 arrears with Multi Choice on the very same account number they told me in December 2014 I had R2800 credit. As a result I did not pay the November and December 2014 installments in order to use up the credit I had with them. I was then informed that my ONE account number with Multi Choice had THREE sub sections. The statement only reflected one of these sections under which I was in credit. I was told to pay up before I can be re-connected. Why on why must I be inconvenienced as a result of Multi Choices errors? Just another example of the monopoly bullying the individual! Well after having subscribed for over 10 years, Multi Choice can keep their service!! They clearly could not care less!