My account handed to nimble group,

Bad service from netstar, hopefully the whole world can see my review, from the very first month the tracking unit was installed on my vehicle I noticed that the location of my vehicle on the map is always incorrect, I informed them they said they will send technicians to test unit ,debit order went through for the first two months but still technicians never came to check the unit ,on the 3rd month that's when I started reversing the debit orders because I can't pay for something that is not working, I even removed the battery terminals to check if the controll room will notify me, but no one contacted me,that proved to me that netstar don't care about customers,only cares about money,late last year they handed over my account to nimble group, I started receiving calls from nimble group, demanding me to make payment but they don't know what is the story, I keept explaining my self to them on daily basis, again earlier this year I phoned netstar, I was advised to send an email to netstar account, I send the email, got response saying that I will be contacted within 48,but no one called, I even sent email to that lady sabelo d working from nimble group, she didn't reply to my emails, hope this message will reach to the top management of netstar, or the director, I will not recommend any one to join this tracking company, service is poor ,