I’m not sure
I’m unsure if the landlord would even care as I paid for my full tenancy and I’m not sure if it’s him that should ask for a refund in service charges or something with the building
Realistically any pursuit of compensation would be a total waste of time. Just periodically check with landlord what the current situation is in regard to getting the problem resolved. It will largely be out of his hands but they themselves can apply some pressure to those who maintain it.