No regards for peoples time - massive service failure

I have been a client for many years. I recently changed cars and needed a new fitment. I was called and scheduled for 10am on Saturday. I called multiple times on Saturday with each time being told the time had moved. From 11 to 12, with no communication or engagement with me. Sent from pillar to post by unhelpful agents. What I want is all my recordings to be reviewed and be told what led to such a big service break down. I type this on deep frustration as I was incredibly late for my commitment unnecessarily because no one ever pitched for the fitment. Unfortunately trust has been broken. I am not willing to call on again as that was fruitless. Can someone call me to assist with cancellation. I have also been engaging in WhatsApp with no positive resolution.