Own Agent Screwing Me Over? Wtf!

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Have a property that I've been interested in.

My buyer's agent keeps telling me that he has been calling the listing agent, but they don't return his calls.

But I've been calling the listing agent's office and they answer every time and they say yeah, the property is still available and open for showings.

Today I called the listing agent's office and the person who answered the phone literally told me my agent was ********ting if that was what he was telling me, and I should tell him to quit jerking around and act professionally.

Is this a common ploy for buyer's agents? To tell investors that something is "not available" to steer them towards properties that have already been shown and get the investor to buy more quickly? Or am I being too suspicious? Should I confront my agent about this and dump him if I find out he's being less-than-honest?