Zero customer service

Mercedes Benz bought a Cartrack package with my car sale which is full payment of 3 years for the tracker. However at Cartracker I’m told I’m monthly paying client and I’m owing them monthly payments. Yet my package is fully paid for. I raised with the manager in Gqeberha and he promised twice this would be resolved. This Cartrack issue has still not been resolved Instead im still being harassed by call centre agents on a daily basis asking me to pay the outstanding money I owe I received two phone calls today , last one at 6pm. I still get Watsapp messages daily of harassment and emails Unfortunately Cartrack has left me no choice but to escalate my complaint. It really can’t be that hard to resolve this. It’s not rocket science. This is after the manager promised me the issue was resolved.