Vehicle written off

I regret the day I joined cartrack my car was written off long time and I called them to cancel the contract the lady told I will be charged R800 to cancel I asked y coz when i joined they never told me that I will be charged to cancel anyway I will pay it month end when i have it when i call again the amount changed to R2800 I asked again whay now it's up and I don't have a car anymore that's y I'm canceling I was angry with that did not pay it they called I told them I don't have a car anymore I called for the device to be removed out of the vehicle so that when i have another car they can install it again they never did that now they blacklisted me i can't buy another car for what they did that coz I called to cancel I don't know now just last week I called again to pay this of when i have money they sad I must pay R2900 to cancel and 2300 for arrears and a R1800 to be taken off ITC I told them what they doing to people is wrong coz they not tracking any vehicle of mine I'm gonna pay them for nothing yesterday money was up again to R7000 really what is going on and they called my brother to offer a device I told him not to take it 'coz they will blacklist him and charged him money for nothing when the car is involved in a accident I really regret the day and I don't want any of my friends and family to join this