My rights taken away with zero communication

Hi,
I posted an ad a week ago to sell a kitten of my own, and my ad has been removed straight away with no explanation and no refund.
I tried for days to get some information but only had robotic answers that I breached the rules, with no more explanation of what rules I was not following. Also I was informed I couldn't get a refund as I didn't comply to the Gumtree policy, but at that still didn't know what was my "supposed" mistake !
It took 5 days of patience to finally have a human answer through the live chat (by the way it's not really a chat, because you cannot "chat" with anyone, you are sent an automatic answer and disconnected straight away), and I was vaguely told that I've already posted 2 ads for pets in the last 12 months with another account, which is completely wrong and I wonder where they got that from ?
I offered to send my ID to prove that I'm a legal individual person, or talk on the phone or on video to someone to show I am not usurping anybody identity, but no answer and no possibility to talk to anyone.

I have the right, like any other person to sell kittens and if they don't accept my application with no reasonable reason and evidence that I did wrong 

Nobody to talk to, no investigation from their side, I want my rights back and sell my kitten before I have to drop him in a shelter instead of him having a loving family. As a woman, I feel discriminated and isolated.