Mortgage was offered but service charge dispute causing delay

I own a flat in a converted house and own a freehold share of managment company and I was recently successful in getting a mortgage offer. My nightmare statred when the conveyncing team wrote to another co-director to verify that there are no major work in the near future due. A dispute between the co-director and me over the way we spend our service charge and sinking fund money led me to withhold payments. No invoices were raised to me and no notice s were issued against my property to date. However, the application is held back because the conveyencing team need confirmation that no notices are raised against the property and no major work in the near future is due.
The nightmare stated when the conveyancing team wrote to the co-director. He is claiming that the building is in a mess. He also, added that it will need a massive estimated bill to repair. I beleive that he only didi this as act of spite designed to scare away the lender. Despite that I had the lender's surveyor report whom inspected the property and passed it for lending.

The other co-director also refuses to confirm the rest of the lender’s enquiries and my offer’s expiry date looming what should I do? If I take legal action it will not be resolved soon. Can you help? Can the broker speak to the lender and explain that the neighbour’s action is causing me stress. What would you advice?????