********* business practices - Netstar debiting additional funds

I purchased a new vehicles (selling my old one ) and needed to move my profile from my one vehicle to another. I timeously notified Netstar in September already about what i required. They have however still been charging me for two vehicles. After numerous calls and back and forth with the retentions department they confirmed in writing that a cancellation fee would be waived and that my premium would be R129 per month. Now i see that my account has been debited yet again for the 2 car fee. After calling in yet again they now advise no a 30 day notice period of cancellation is required. Both the consultant and manager were unable to assist. In my opinion this is an ********* way of doing business. As a customer i do not fee valued by my service provider but ********** and ****** from instead.