KYC verification failed. 3 years old account and I cant update my residential address

I have received a request for proof of address, my account was successfully registered 3 years ago and now I am requiered to proove the same address that I had 3 year ago. I have changed the country of residence and when I try to update this info I get a troubleshoot, I contacted support many times and they dont do anythingn about it and my docs are keep being rejected, Please help to solve it asap!