worst service ever

i bought my car around late October 2020 it came with the tracker already fitted. i noticed after 5days that it wasn't working. i had to drive 170km from where i stay to get a new one re-installed. i expected everything to be fine only to find it stopped working again. when i called mid December i was told it can only be fixed after 11jan 2021.on the 11th the technician came and installed another unit after which he said the system is down i must call again and Lodge another complaint. so basically i have installed 3units in a space of 2months.while i pay a full amount... on top of that if i do not call the company then they won't bother call or make sure if i am sorted. my worst regret ryt now is that it is a contract and there is a cancelation fee which is still high at this point........ i am drained.. please advise