Tracker *****ing my money

Very bad experience with Tracker Sold my vehicle in 2014 did notified Tracker and stopped the debit order instruction after a month. After a while i changed bankers and without noticing, it came to my attention that the new bankers reinstated my old Tracker debit order, when it became known to me I requested my new bank to stop the monthly payment as i don't have any vehicle tracking system with them since 2014. Now bear in mind they never called me to test the unit - like they suppose to do - and if their claims that i owe them the money are valid why did they not deliver on their so said service. Now after i stopped the monthly unauthorized deduction Tracker started to call me suddenly and demand a few rand i owed them ... After explaining to different law firms calling me, Tracker their client are in the wrong as in actual fact Tracker owed me about 3 years + monthly payments which they were not entitled to, they just slam the call and the next law firm calls again ... sometimes 3 calls per day requesting the cancellations, which i can't provide anymore as it was 2014 and we in 2022. Husband has 3 other vehicles with Tracker that he want to cancel all their units in our vehicles and use a different company I'm tired of their bad customer service!!! Can one of their managers that can understand my frustration please call me as i'm tired of all the explaining How on earth are a company instructing law firms to call you constantly and you "own" them according to these firms +- R600 ...