Multichoice account cancellation and connection

In September 2014 we cancelled our Dstv monthly subscription as we were about to leave the country. In December I called multichoice to reconnect our service as we bought a holiday home. The operator then told me that our account is in arrears with R3900. Our subscription was apparently not cancelled by them and they allowed the account to accumulate until June of this year. After hours on the phone with them, I was promised that an investigation will be done but every 3 days our account is suspended again without any feedback from multichoice. The team leader told me that I should provide her with the exact telephone number and date that we called to cancel our subscription, but this was done over a year ago! Normally Multichoice will suspend your subscription after one month in arrears, so I really find it difficult to understand how they left it to accumulate for 8 months. After numerous phone calls this issue is still not sorted out, every time I call we start from scratch.