And here is some good news for me… I had almost given up.
After messages to support, reports on Signal Conso, emails galore, I was finally unblocked today 
They apologized for the misunderstanding and unblocked me. It’s crazy, all this, and now because of it, I’ve lost all my visibility… I’m starting from scratch, but the main thing is that I have my Vinted account back!!!
Never lose hope, especially when you have nothing to reproach yourself for.
Thank you for your help 