Bad Service

Dear Sir/Mam<br> <br> In October 2014 I have called the call center of Altech Netstar as i had a tracking devise on my car with them, I called to let them know that i don't have a Car anymore and they must deactivate the tracker on the car. The lady whom i spoke to said to me its oh k she had noted everything down. The next month which it was in November they didn't debit the my account and i was sure that the acc i had with them it was deactivated. <br> <br> In August 2015 i have received a call from their call center telling me that i own an amount of R 199 that has laps on my account, I was given absa banking details that i had to deposit the amount owed. I went and deposited the money on that account which i knew that now my acc was settled with them.<br> <br> In October 2015 I have received a call again from Altech Netstar that i owe them R 450, I tried to ask what was that for they said to me my acc is still active, but to my understanding i have called in Oct 2014 to cancel it. The lady told me that cancellation its not done via telephone but i have to write a letter, I then wrote a letter via email and explaining all the issues to them and also telling them i am not going to pay the R 450