Very unhappy with service

I recenty purchase and car and in the finance Altech Netstar was part of the purchase. DVM fitment centre came out the 15th January to fit the unit and because I had to find out from my insurance if the panic button was nessacary or not so no instation. Friday the call centre called me beacuse i wanted another vechile of mine fitted and they said that the fitment for both cars will be fitted together. I had to call back the 20th to find out what is happening and DMV fitment centre only came out the 22nd January. That evening after fitting the tracker my one car wouldnt start, I tried to call DMV fitment centre but there line dont work after house, I had to call the Netstar emergency number and insist that another tecnition come out but thank's to the call centre they came out and a plug had been put in incorrectly from the instalation but also my petrol gage is also not working now all of a sudden . On the 23th January i called the call centre and was linked and signed up onto the website but only one car was reflecting, 7 days later i get an e-mail saying the testing was unsuccesful. really to this whole time i must pay a pro-rater for what????? and a broken petrel gage