Service failure

I must say im very disappointed with the service received from cartrack. I called on friday to open a new account. I was then transferred to fitment dept to arrange for installation. They confirmed appointment for monday morning. I thought everything was fine as i am an existing customer for more than 6yrs now. I took delivery of the vehicle only to realize today that the installation was not done. I called the helpdesk in the morning to have this resolved urgently i was too many stories and was promised a call. Up until now no call received, i already lost an income for a day as i cannot use the car without the tracking device. I trusted you guys for soo many years. I would like to have the contract cancelled as you failed to deliver and would be cancelling all the other contracts i have with you. Acc no Mahl01662 cell no ***