This is why it is essential to use lender/brokers recommended by your agent. These recommended brokers/lenders have a tract record and ACCOUNTABILITY to closing on time and under budget.
There are brokers and lender that MUST BE AVOIDED! For instance, "Never Ever" was so negligent (and they admitted the same) that the seller, who had moved to new location in anticipation of closing in 2 days, was forced into foreclosure due to the mortgage brokers negligence. This bank has made no effort to make the parties involved whole again.
If you are dealing with a 'to big to fail' you should consider starting over.
You may attempt another direction. A local lender who has a track record of investing in the community through small business loans and home loans. These "A' and "B" graded lenders have demonstrated a commitment to their community. By contrast the 'too big to fails' will all be "F" gradeed. Enter your city or zip code and select the "A" or "B' grated lender that appeals to your and see if they can rescue your situation.