Still awaiting repairs 9 months later

Hi everyone, hope your all happy campers today. Unfortunately last June we were involved in a total non fault accident with a taxi. They admitted fault and we were processing the claim through an accident management company, three month later and no further forward we went direct to the insurer. Today it is 99 months since our incident and our Motorhome is still parked at home in the garden awaiting repair. As the Motorhome has been stood unused the brakes, discs, tyres have degraded. the area of damaged from the incident has left lights, garage and habitation seal open to the elements, which had probably caused further internal damage too. I haven’t started the Motorhome, as thhe rear light unit is full of water and I feel this may cause additional damage. After complaining to the insurance company about time lapsed possible further damage etc, they sent a final response ( having never rang us to discuss the complaint) and with the letter a compensation cheque for £250 🤯. We have now complained to the financial ombudsman, as this whole situation has been mismanaged and we have been left firstly without our Motorhome, as it is not road worthy and want to know if the degradation and possible additional issues caused through having stood for 9 month will be addressed too? Any thoughts or experience appreciated Leigh & Janet