Stay away from Matrix car tracking service - appalling client service

I'm trying for two months to remove a vehicle traded in for another one,but with absolutely no joy at all. Emails send to each and every availability I can get hold of to cancel the one vehicle - outcome zero/ nothing. The only outcome was to cancel my monthly debit order and then all of a sudden the threats to hand my account over for legal action. Phone calls: numerous and the same outcome. Absolutely appalling service and the worst client service you can wish for.