You don't need a lawyer for that, office issues a letter that there is no debt, it's just a case of seeing a copy. Office also supplies AGM minutes and accounts
One potential big banana skin is Bangkok Bank is the only bank used now, used to be Kasikorn as well, so could be a sudden decision same as Kasikorn stopping availability
The problem with supplementary fees rather than increased common fees is they aren't included if someone is taken to court for non payment, the advantage is it gives buyers the impression common fees are lower than they actually are