Bad service

Help 24 took my car to RARC for my car to be fixed.<br> <br> I am not happy with the service that I'm getting from RARC. Every week when I call the is an unforeseen part that must be ordered. Last week they said it's a <br> <br> and clip and a damper,Was told that with Mazda it takes 4-6 days to get the parts and they still waiting for insurance to authorise and when I called today the is another unforseen part and they waiting for insurance to authorise it's going to take another 4-6 working days to get the parts. Why is it that they notice this unforseen parts one by one. I'm even scared that next week the will be another unforseen part.<br> <br> How long must I wait to get my car back. I am really angry and it's inconveniencing me.<br> <br>