Poor customer service

I sent an email on the 29th of October to cancel one of the cars on my policy because I couldn't get hold of them over the phone as they take so long to answer and my airtime ran out. Phoned again today after not receiving any response from my email, the lady said its 20 days cancellation notice, thus my debit order which goes off on the 1st will still include that car. I told her I sent an email on the 29th already, they just don't respond. She says its not her problem, I only phoned today, but I can change my debit order date so that the 20 days goed by first. Had to then talk to someone else to move my debit order date. Such an inconvenience, poot customer service, really not impressed with Cartrack. What is the point of emails if they only help you when you phone? Useless.