Would not taking my calls or returning my calls regarding leasing information for a nicer property considered being discrimated against

I have been working with Mote and Associates leasing agency since June of 2015. I have been working with Sarah who is the associate broker since I found them online. I have explained to Mote & Associates that I would like to look at something that is larger and nicer that would accommodate my business needs. What unfortunately I have only been directed to areas that are not very conducive to my business needs. Typically I am only shown spaces that requires alot of work and not a good fit for me. I recently inquired about a nice property and since then i have not be able to get a call back, they won't even answer any of my calls when I call them directly to the office. I had someone else call and they were able to get through to not only the office but to Sarah directly. I am beginning to think that they are only showing the nicer properties to certain clients and the more rundown or really needs a lot of work to African American clients.