Original tiles and common property

A piece of my glass splashback recently shattered and was replaced under our Strata insurance policy. The splashback was made up of 6 different shaped pieces of toughened glass and was attached to a boundary wall in my kitchen. It was installed at the time of building. The strata manager claimed that the Owners corporation would not pick up the bill for the excess on the insurance claim to repair it as it was within the lot and anyway, a glass splashback was not the same as ceramic tile ,which would have been classed as common property. Any advice on this one?