Cartrack contract

My car broke down in December 2024 until today,few months later business shut down,now cartrack is taking every cent that comes to my account making my life difficult, I asked them to cancel the contract they say I must bring account to date first before they cancel, the settle amount was R2650 and I filled the forms as well,today the money has gone up R3532.60 plus a once off fee of R870.00 plus they need to take device out,is this legal?every consultant is telling a different story