Please add an option for a zero rating.

Even after thinking that my shockingly bad experience with Cartrack has been resolved at last, I still received no less than 8 phonecalls today (so far), requesting payment of R134, even though the cancellation certificate has already been sent to me. Earlier this morning they even sent me a message requesting that I pay R66583. With the last call I received the lady from accounts told me she won't be able to see to it that this harassment comes to an end, seeing that it's not her department. I've never experienced such incompetence in my life. EVER!!!