Hi. I feel your pain. Hope it is repairable by pulling and painting.
I'll be interested in your Council's response. When I made a claim with Wiltshire last year re tar damage at road works they said it was nothing to do with them and I should contact the contractor. I replied that they were the Statutory Authority for Highways and if they wanted to sub-contract then that was their business and my claim was against them. They then quoted the GDPR as to why they could not pass my claim to the contractor. I replied that I held the council liable but they had my permission to pass on my details, which they did.
After 8 months and no action - any emails to the council simply got forward to the contractor - I made a formal complaint and threaten to go to the Ombudsman. Suddenly I got a letter from the contractor offering a goodwill settlement (what I claimed) without admission to liability.
So stand your ground if they get obstructive.
I recall reading that there are few companies expert in aluminium repairs and therefore could be costly and the council might offer no more that scrap value. So if you can find a good local bodyshop who can pull it out, fill and paint that might be a good compromise. Aluminium is soft, so they need to be competent - no bashing like steel! I used a body shop that was into restoring modern classic cars. Getting a good colour match is key.