Rejection of claims

We recently purchased a home & the ceiling collapsed. I called in and after numerous follow ups, a contractor came through. My claim was rejected due to non maintaince of the roof. OOBA never took into consideration that I just bought the property and was unaware I had to make sure the roof had to have nails on them. I was told that the non maintenance of the roof should have been declared on the OTP, which it was not as we never had visual of the roof. I was also told that the wind contributed to the ceiling collapsing when there was no wind. All of this information was submitted by one contractor only and not multiple due to the fact that I'm sure they will get different inspection reports. Over and above that, they ignored my previous claim for my bedroom, added it to this claim, and rejected both. Clearly Ooba insurance is a **** and I'm sure they will find many ways to reject future claims. People require a trusted company to handle claims especially for their building and Ooba isnt one of them.