TIRED AND UNHAPPY OF POOR NETSTAR SERVICE!!!!!!

If i could rate 0 stars then i would!!!!!! I am fed up with netstar and their ridiculous service. Ive upgraded my unit to for the early warning system. Its been a couple of weeks and my unit is still not picking up the location., it's not updating at all since they've done the upgrade. Ive called in today and the agent said that they will send someone out to replace the faulty unit turn around time is 48 hours so what happens if anything happens to my vehicle?? Who's going to be responsible? What's the point of having it installed if it's of no use yet i have to pay every month. So this month i pay again for a unit that wasn't working?????? They have very poor communication skills. Im so tired of calling in and wasting so much time explaining or even waiting for them to answer my call. I even texted the guy that installed my unit and he blatantly just ignored me. Read my message and thats it. Ive been with Netstar for many years and im really disappointed in their service recently. Fix it!!!! Why must i wait 48 hours before you have this unit replaced or to receive a call for booking. You're suppose to attend to your clients needs immediately!!!! If i don't have insurance then what??? I would like a manager to contact me because it's not the 1st time having an issue with u people!! UNHAPPY!!!!!!!!