Reported that tracker not working, but not helped

The tracker in my vehicle stopped working on the 7th November 2017 and reported to Altech Nestar, but nothing has happened. However, debits continued to go through. I was sent to their agents in Durban on the 11th December 2017 for the device to be fixed, but the agents did not help me. I immediately called Altech for help, but was sent from one person to another. Everybody i spoke to told me that they would come back to me, but no one did. A debit went though again on 2nd January 2018 and i went to my bank and reversed 2 debits because i was paying but not getting any service. On Wednesday 17th January 2018, i got a call from a 013 number and was told that they were acting on behalf of Netstar to collect an outstanding amount from me. I called Nestar and the merry-go-round has started again. Please help! Kennedy