Bad service,breach of contract and bad attitude

My problem started when my tracker unit was deactivated due to re-installation of a new battery.therefore tracker called me indicating that they cant pick up my car's moment.I then called them in two or three weeks to indicate that the reason why they are not picking the moment is due the replacement of battery.The lady at the call centre indicated that they have to sent a technician to check the unit and it come at a fee because my warranty has expired. I will call the call requesting them to send the technician and they will agree but not action my request.In December last year ,i spoke to Mohamed who indicated that my contract has expired,the i have the option to sign a new contract or continue with the old contract.I then request him to forward the contract so that i can read it and i read it.in march i received a call from a lady from tracker stating that they are going to sent a technician to reactivate my tracker and she said they have stopped deductions ,my question was that who authorized that the contract to be terminated.Two weeks ago i spoke to another lady stating that they are going to deduct as per the new contract that i have never signed.