Terrible follow through with complaints on repairs

Client service is really bad. I had problems with a recent repair on my vehicle. Repairer didn't repair all the items and I logged a complaint with a claims consultant. Who started off great with lots of emails and questions, but when it came to follow through on what was complained about, all fell through the cracks. It has been 3 weeks after I took my vehicle back for an inspection of the mentioned complaints. Notified my insurance and yet no works has still been done to my vehicle. Called and sent emails to the claims consultant handling my case and same story- no response for days. When they respond it leads to nowhere. I am really disappointed with the service