Bad Insurance Service

I have a house insurance with OOBA , informed them last year that i am renting my house thus is occupied by tenants. when i decided to move the tenants out, i found out there are damages on the house, and created a claim with ooba, but hollard called and told me that's not thier responsibility but everything that's damaged its part of maintenance, in which i informed them on time about the house rented. The tenants did not inform me on the things that are broken, which means i did not know in time when there was a problem, only found out after.