Unfair treatment for 3rd party claim process to cheat me of my rights to have my car repaired to its pre accident condition

Submitted my 3rd party claim for an accident where my car was hit by the insured who did not make a stop before entering a public road , I was told I am 20% responsible for the accident then I was given a quotation where the intent was to make their quite 20k cheaper than my quote by omitting parts and underpricing the quote , I took the quotes to market and not a single place agrees to the undervalued quote Miway today has not come back to me to arrange a physical valuation of my car or the advise on the quotation . What’s even worse I am a Miway client and I have just cancelled my policies after the experience