Let us know if there is more information that provides a better understanding of your circumstances. Realize that if your agent is a Realtor, a member of the National Association of realtors, we agree to a standard of professionalism. There are also the legal requirements that all agents are to adhere to. We do recommend that consumers seek legal advise for a variety of contractual matters, disputes, and equitable title matters, but I would still recommend you contact the branch manager or broker to begin with. Perhaps they can remove your concerns. Also, there may very well be a legitimate reason for the agent not being able to contact you.
This is a most unfortunate situation. Our recommendation is to contact the agent's office and request to speak with the Broker.
There may be a good reason you have not heard from the agent that the Broker can help identify for you.
I can assure you we're not all like that.
Shoot me an email back and I will see what I can additionally find out for you to try to give you a hand.
I am sorry to hear that your calls are not getting returned. Do you have a writen Buyer-Broker agreement with this agent? If so you may be wedded to your agent. If not I would put them on notice to withdraw your offer (in writing) and them secure a Realtor to represent you. Good luck.