Standard bank home loan building insurance

Bought the house 21 years ago. Obviously the evaluator done his job and that is how we have the bond granted in our name. The boundary walls was part of property when we bought the property, otherwise the bond would have not gone through. Now the boundary walls are collapsing and need attention as this specialized rock wall needs a specific workman to repair the wall. Standard bank has refused to repair any boundary wall and their pathetic excuse is due to poor workmanship. This wall is standing over 40 years now. It's rather fair that the home loan insurance be reversed from inception with interest so I can repair the wall myself. I am not currently Ina financial position to repair the wall myself. Standard bank home loan insurances is one of teh biggest ****s around. I have paid R403200 worth of insurance since inception and I am being ********** as they refuse to repair teh boundary walls. Makesnme wonder as why we pay insurance then? They don't even deserve the one star rating.