Netstar is very bad

If it was possible i would rate a negative. I have been charged for a unit that i cancelled in less than 2 weeks since it was not working. i bought a 2nd hand Audi from the dealer and they said they will install the unit at the dealer only to find out nothing was installed coz the car had the old device. they sent me as SMS that it has been installed and active now, also an email with a fitment certificate. when i couldn't see the car location on the app i called to ask them then they said the option u choose u cannot see the car then i asked them to tell me where my car is, they couldn't tell because the unit is not working. they logged a ticket, 5 days after i called since no one contacted me, then i asked again they couldn't see the car, i then requested a cancellation because same morning i received a reply to the email i sent that the unit is old and out of warrant so i have to upgrade to a new one. only to find out they only changed ownership of the unit and never tested it. then they said i have to pay for that month and also cancellation fee. ever since i am battling with me because i am refusing to pay for a unit that never worked. had my car been ****** within that period they were not going to repay me anything. their service is very very bad.