Bad customer service

I took my car for repairs because the control unit was damaged. Paid deposit for on the 11th of November for the parts to be ordered from Germany. they said it takes 6 weeks for the parts to be delivered. i did not get any feedback or update on the order. on the 18th December i decided to enquire about the progress of the order. the service adviser informs me they ordered a wrong part. i have to wait another 6 weeks. i asked for a loan car since they are the ones who ordered a wrong part. I was told they don't have cars available. Complained to the service manager about the bad customer service but I'm not getting any assistance.

I've been their customer for 5 years but they are not willing to assist me.

i don't like racializing problems but i'm paying black tax