We really don't have enough information to craft an informed response here, but I will say, I hate hearing stories like this.
While I will generally default to the mortgage professional for direct questions regarding the financing, real estate professionals today also need to be educated on the various loan products and how they can ultimately affect the transaction.
An experienced real estate agent in my opinion has to be well-versed and be knowledgable about the different loan products available, and how each will ultimately affect the transaction. Agents who are unresponsive and simply push all financing questions off to the mortgage broker blindly are doing their clients a major disservice. An agent's job is to get their clients THROUGH closing and manage the ENTIRE transaction. That means they have to know a little bit about everything - not just show you some houses, write a contract, and hand it all off to the mortgage broker/attorney, moving on to their next client...
Please provide some additional information surrounding the situation so we can more accurately advise you.