Shocking - zero service, installation not done.

I have signed a contract, the contractor was supposed to install the device on saturday at 10h00, they phoned me after 10h00 telling me he is late and was still very far from my home, couldnt tell me when he would be there and I could not wait hours for him. Asked for the installation to be scheduled for the following monday and it was not done. I was then called and told to wait till 2nd april when they next have availability! But now my car has no tracker on it, and I have been chasing their marketing department and heard nothing. Absolutely shocked at this low level of service and care for potential new customers. I dont know what to do they phone me and cant give me a proper answer, I have been emailing and told I would be called - no call. Shocking, contract signed but now no tracker in my car?