Poor service

Netstar service is very poor they make empty promises and their agents are not professional i called them more than 5 times my tracking device stopped working 3 weeks ago on the 24th of March it shows the wrong location i even called them to tell me the location of my car and they told me a wrong location and the last movement of the vehicle shows the 24th on their system yet I am using my car everyday they promised to send a technician to come to me and fix the device the very same day no one came and i called again the following day they promised me again then a week later i called again then their agent made me hold for more than 20minutes till my call goes back to the operator just because i wanted answers on why did anyone call me to arrange the device fix on my car then i called again asked them to get me the supervisor and she also promised that she will book a technician and the available slot was on Monday today its Wednesday still no one called or came to me to fix this device i told them that i wanted to cancell they apologised and promised me to send someone on Monday today its Wefdnesday still nothing i really dont know what to do anymore all i need now is for them to cancell this service and i will get a better tracking company we are not safe at all with netstar