Building insurance claim

i am so frustrated with bettersure building insurance I've logged a plumbing case with them for the passed 2 months. I fixed the damage my self and sent them the necessary documents they required from me. Just after that they rejected the claim based on what their plumber told them. I requested the email and documents that their plumber produced they failed to do that they promised to send their assesor which didn't happen. Its 2 months saying that my case is with their underwriters till today is hard to get them on call, email its frustrating. Just a meet plumbing pay out takes so long to be solved???What about big claims are they gonna be pay. I have proof of every conversation i had with them though calls i recorded each and every conversation to prove my story with them

Please sort out my payout as much as i pay my premiums @bettersureinsurance