Been trying to cancel account for 6 months

I've been trying to cancel my account for over 6 months. The tracking unit has never worked properly and the SARS logbook feature has never worked.<br> <br> Every time I call I get to a different person and get given a different amount that I owe even though I gave the required 1 months notice last year. The last time I managed to speak to someone at Netstar I was told that I had signed a 3 year contract and I was trying to cancel early. This is the 1st time I've ever been told this and I did not agree to a three year contract. FYI my contract was initially taken in 2010 and Netstar have constantly had problems with this account. I've been handed over to a collection agency who don't care that I'm disputing the account and that the amount being claimed by Netstar is incorrect.