i have a neighbour (where i am staying) who faced this problem recently. She has to resort to sending a letter of demand (from her lawyer) to the owner despite being in touch with the owner who had always expressed willingness to rectify the problem but delayed the repair for a long time.

That's the second course of action you may want to consider depending on the quantum of damages (versus legal fees etc) to 'compel' action from the owner. Issuing a letter of demand is not costly but actual litigation is.

in my friend's case, owner finally got contractor to come after getting LOD ...