2018 mva claim still unresolved

I hope Momentum will assist me. My car was sent in to Cranbourne panel beaters in May 2018, for MVA repairs. I got my car back in July and realised the antenna had been broken off and there's a new dent in the RHS driver door. I have contacted Momentum several times to resolve this issue with Cranbourne. I took my car back to Cranbourne as well in July to show them the new dent and missing antenna. We have photos (taken by Momentum staff) as proof that there was not a dent in the RHS driver door nor was the antenna missing. Cranbourne said they would confirm with Momentum. I have phoned and emailed several times with no luck. Please sort this issue ASAP. It's been nearly a YEAR!