Unfair rejection of my rental application

In January I was rejected for rental at Thristle estate after Madelyn handled my application. She told me that my TPN was an "F" while the acceptable scoring was A to C. This was basis for my rejection. I checked my TPN this week and I now had a "C" scoring. I told Madelyn this and she did confirm that I can re-apply. Lo and behold, today I get a credit report from Experian as basis for my rejection! This is not a credit application. I am not applying for a loan I am applying for rental!

My TPN score is now good and suddenly my credit report is used as basis to reject my application. This is not fair. It appears to me that you looked for reasons to reject my application. It seems like you are keeping certain kinds of people from staying in your premises.

Yes you may have a discretion as to what kind of scoring you use to evaluate potential tenants but this discretion must be rationally informed. How come my last rejection was based on a poor TPN and suddenly when my TPN is okay I am rejected?