Rejected storm claim

Insurance claim rejected for preexisting faults for storm damage and still no rejection letter received.

After a terrible natural disaster of storm, I logged a claim with standard bank, to my surprise they say there's poor workmanship on my roof, I bought the house 2 years ago and when I asked why how did agree to cover my house if there was a poor workmanship, I was told I was suppose to inspect the roof before I purchased the house.

Who on earth goes on top of the roof to check if its done properly when yiu view for buying.

It took them 3 full weeks to come up with this rejection after sending 3 assessors to come and assess the damages

The damages are ceiling and carpets but I am told its poor workmanship and preexisting faults hence they are declining my claim.

If it was preexisting I would have experienced this before the storm