Wow, that's really unusual that you are NOT getting a response from an agent! I don't presume to speak for this agent in any way. But, sometimes there are agents who are only selling real estate part time, so they are not as up to date on their communications and correspondence as a real estate agent who is helping sellers and buyers full time.
Just know that ANY real estate agent can help you with ANY property. It might be a good idea to make some phone calls and talk to an agent that IS answering the phone. Explain your situation. If you have a property to sell or are looking to buy, a full time agent is at your service and eager to assist you with your goal. I mean, if an agent works at this FULL TIME, this is how they get paid, so it's in everyone's best interest to have their eye on the ball~
Good luck, Theresa!