tracking fault very very bad service

We have had a tracking problem for the last 4 months -- i have sent over 20 emails to netstar customer service and the keep asking me log in details or account number witch i gave them i asked them to call me to resolve the problem but no one called we have been with netstar for 20 years and the service we are receiving is non existent to netstar please call me on monday at 10:00 in the morning we have a fleet of vehicles and the main function of netstar is to see where the cars is at all times which is not the case at the moment my number is *** shauns taxis we want to cancel our contract because of this lets see if there is any response now