Very Very Poor service and incorrect billing

Good day

I just want to start of on saying that nothing has changed from the service of this company, I was contacted by one of their agent after the complaint i logged and was given an amount of R241.64 to settle with them and i did so, and it was confirmed that the contract is canceled, so on the 28 of October i received another bill of R141.50 and my account was debited with R73.14, So this is basically *****fully scheming money from people and there phones will ring all day, Please can i get a solution without spending another cent on something that i canceled and not even in my vehicle anymore for months already, I'm already using another tracking company that is customer focused.