Impossible Upload Proof Of Address(POA)

I’m having some issue uploading my proof of address (POA)
Everytime I try to submit proof of address I get a warning message : " Your address cannot be changed"

Dear @beslime-acouchy-2, thank you for joining the community. We regret to note this. However, we would need to check further into your issue. Kindly reach out to us via LiveChat, for better assistance and protection of your account’s data. We’ll work with you to resolve any issues as quickly as possible.

how can you be reached through LiveChat?
I’ve been trying, but the bot answers me

Hi, @beslime-acouchy-2. We are sorry for the inconvenience you encountered when trying to contact our LiveChat support. We recommend you try contacting us at a later time to talk with a live agent. Additionally, you also may contact our WhatsApp support to assist with your issue. Thank you.