Cancellation service

I have had a good relationship with cmh midrand for sometime up until lately… i booked my car for service of which the service couldn’t go through because of the service provider, now i asked nissan to send an email to the service provider to tell them the service hasn’t gone through, till today they haven’t done so… my car cant go to service anywhere cause the claim with Nissan is still hanging, this is a horrible experience and at this rate il never take my car to them anymore