Pay R800 to cancel my account of more than 7 years

Before i go into my report need i stress that i have been with Tracker for more than 7 years having installed their tracking unit in over 5 of my cars. 30 April 2013 i bought a new car, and i arranged with tracker to transfer a unit that was in my previous car a ford figo to my new vehicle. I got my car fitted with a skytracks unit and i had a receiver unit in my ford figo. i Kindly asked tracker to remove it and install a receiver in my car. I was told there is already a receiver unit in my car so i would just pay R395 to have my account transferred to the unit. No one told me or mention that i would be taking over anybodies account. Mind you I was already out of my 36 months contract and was now on a month to month. In October 2013 i had a billing problem were tracker had actually cancelled my tracker account with out any reason given to me. my account was just re-activated without a proper explanation why they had cancelled my account. Today i want to terminate my account i'm told i have to pay R800 for a contract that does not exist. I called tracker on 9/02/2015 and i was told they would investigate and come back to in 5 days. i have not received feedback to date on my query.