FlixBus complaint: Driver denied boarding, Flixbus refuses to fully refund expenses

Purchased Flixbus ticket online at Flixbus UK Ltd for an overnight service from Paris Bercy to London Victoria. Despite being on time at the bus station, complying with terms and conditions and having a valid ID to enter the UK, the driver denied boarding, made inappropriate comments and behaved unprofessionally and unethically. It was the night of Sunday 19/11. I was forced to find alternative transportation to London, first available was Eurostar in the early hours of Monday 20/11. Had to book a hotel next to the train station to rest a few hours and shower. Public transport had closed so had to take an Uber from bus station to hotel. Contacted Flixbus within 1 hour of the events. I provided all evidence and details within 1 week of the events. I requested a refund of the above costs as well as the original Flixbus ticket which could not be used. Over 1 month later and after multiple long emails, I have only received a partial refund and a ation that my claim will not be escalated any further.