Dishonesty, negligence and poor customer service

My son dropped off my car on the 17th of July and was told that it will be ready within 10 - 12 days which I expected by the 1st of August. 22 days later the car is still with them. I made calls and told excuses of what I would like to hear, then on the 14th of August I made a group call to Steimar and Prime only to discover that, Steimar ordered the wrong part but they never told me nor apologized to me. I suggested priviously for a courtesy and my email was ignored not even a response. I am being inconvenienced by someone's negligence and no care for customer service. I am really disappointed.