UK Landlord Forum / Life

I'm a landlord letting a flat. About two, there years ago our agent told us that the hot water tank does not provide hot water so because the development was new, they reported this to the developer to look into and stated that there should be no cost to us, relating to telephone instructions to not appoint engineers as this would void warranty.

The tank was replaced and we didn't think much of it, until last year, when an independent audit found that the work was carried at a cost and incorrectly charged to the building fund as tanks are not "communal" and it's our responsibility to repair them.

That's fair, but the building management company that carried the work is now demanding the money from us, which I think is not legally binding.
We have not been told of a cost to inspect or replace the unit, not to mention that tanks only needed a valve cleaning as the same issue happened a year later, which cost £60 not few thousands they will want to charge us.

I can't get through to Citizens Advice but just wanted to ask if you feel the same that a contractor can't do the work without authorisation of cost especially when the agent clearly stated "no cost to the landlord" in their report.