Horrible Service from Netstar

I bought a car in October...took on Netstar as my tracking company...received a welcoming email from them and that was it...I was not given a panick button or did anyone contacted me telephonically to explain how it works but came monthend they were quick to debit my bank account. I emailed the lady that sent me the welcoming email...stated my concerns on 25th Oct 2019 till today i have not received any response from them. I then reversed their debit order to get their attention to no success... Suddenly today i get a call from their debt collector saying i owe Nestar for 2 months....How can i be paying for something i am not happy about...And should anything happen how will i report my ****** if they dont answer their phones or respond on emails...They have the worst service and I dont need them mxm!!!