HELP!! I'm not sure if this is mean or not right to do.

[Jonathan Polanski]

So my realtor found a property for me. this property is listed on the MLS for 75k....She contacted the listing agent and submitted an offer for 76k in cash. The property is in good shape there's a tenant that lives on the property (He's moving out in 2 days) and its easily worth about 220k, Owners are retired and want to get rid of it.

Listing agent isn't responding to my realtor. (she called, text, and emailed him. she even contacted his office and they said he's not available) I honestly think it's because he wants to keep the full commission instead of splitting 6% with my realtor. Because I called him and HE ANSWERED ME (after my realtor tried multiple attempts of contacting him).

What do i do? Do i go behind my realtor's back and contact the listing agent and submit an offer? Or do I just count that as a loss and move on?