Hello Petter,I need help,I fitted the tracking device on my Toyota hillux raider d/c,when the technician is done I found out that he tempered with my anti hijack and central locking which are now no longer working

Hello Petter,I need help,I fitted the tracking device on my Toyota hillux raider d/c,when the technician is done I found out that he tempered with my anti hijack and central locking which are now no longer working. I have been inquiring about this so that they can fix my problem,but they keep ignoring the fact that they must fix their problem. They call me everyday telling me about the outstanding amount as I stopped the debit,I feel like the technician did why he did intentionally so that my car can get ****** easy as I fail to understand why he switched off the anti hijack system as well as the central locking. It’s been 2 years I’ve been querying one thing,they also call me everyday. The contractor ended long time but they decided to renew it automatically even when I am asking them to resolve the matter for almost 2years. Please help.