Poor service for replacements part

I took my Nissan Xtrail to a panelbeater in 5 Jan 2024 after I had an accident. They ordered parts from Nissan SA through Automall. The date of delivery for the one remain part keeps changing. From 19 Feb, to 29 March to 2 April. It is frustrating that I was **** to and told that the part is enroute and delivery will be done on 19 Feb. Only after I called was I told that it was only an estimate. I have been without a car for 2 months. Dates change without an explanation or justification. Feedback is not provided. I have to keep making calls in order to find out more about my order. Will probably sell this car when its back. I've never experienced this lack of service from other car brands I have owned.