I am sorry to hear that you've had some bad experience with agent-s. They should indeed, at least, call you back if for nothing more than common courtesy and professionalism. What type of rental are you looking for? what is your budget and time frame? what areas are you looking into? these are just some basic questions for an agent to be able to help. Best of luck
I would go into a local office that advertises rentals and ask for their most experienced agent and their least experienced agent.
Interview them both -separately, and ask why you haven't been helped already as part of your questions.
You may find there is a flaw in your request.
(Please note: when you choose an answer as a Best Answer, or at least give a thumbs up, it helps those who answer questions here.)