Taking premiums for 2 yrs & 6 months

We sold our BMW car in 2013 February we made hundreds of phone calls to stop this as we are no longer the owner of this car, and that they must take out their tracker we even mailed new details to the company, we moved from premises in 2014 and we los data on computer, when we did our financial statements this year we picked up that cartrack have been decuting R 223.00 for 2.6 years still even after wqe have stopped, R 6690.00 for no service this is very bad for a srevice provider as big as they are, with lots of struggle we went into the bank november and stoppeit by the bank, we also still recieve sms that debit order must go off and they are doubling it . this is very bad and we want our money back as I am willing to get legal action in this matter .