Motor happy ignoring cancelation request

I signed up for a a vehicle service plan earlier this month around 10th July with Motor Happy, to commence on 1 August 2029. Only to find out after a few days that my vehicle is still under the warranty service plan from its manufacturer. I have recently written to Motor Happy requesting them to cancel but they do not bother to respond or to cancel as per my request.

I have even just received an sms from them now, reminding me that they will be collecting the premium on 1 August. Meaning they have not canceled or are not even bothered about my request. This is the sms I got from them:

"MotorHappy: Your account will be debited on the night of the 1st with the amount of R636,49 for your Service Plan. This debit order includes the once-off activation fee. After this one, only 3 payments left until you can service your vehicle. If the debit order falls on a Sunday or Public holiday your account will be debited on the next business day. NO REPLY SMS"

Why do we always have to complain to be attended to?? ONCE AGAIN, PLEASE CANCEL THIS PLAN BEFORE IT EVEN STARTS MOTOR Happy.

This is your policy number MOTON***2