Car repair

I have sent my car for repairs, I was told that they have to order parts and inform me as to when they will receive them so that I can bring my car back in. Now since then there is no update from their side, they keep on telling me different stories. First I was told not to bring my car in because they didn’t receive an authorisation, turned out it was false information. 2nd, I was told they can’t order the vehicle parts because they don’t have pictures of my car and they don’t even know which model. Now every single day I make it a point to call for follow ups, I’m always told that they will check and get back to me, of which it never happens. Please assist!! I just need my car fixed. Now I have a feeling no one knows what they doing in that place. Registration of my car is KV 43 YG-GP