Unhappy with outsurance

Very dissatisfied with my claim being rejected. Firstly I was not even supp**** with a plociy schedule (was only sent to me now after I had complained to them about it). Secondly they rejected my claim so quick on the basis of what an assessor said, surely as a customer I should have a right to dispute what the assessor says or get a second opinion. Will be looking to switch my insurance away from Outsurance soon