The message I got was different from yours. They told me to email their staff first, so I emailed them. They said I shouldn't use VPN and I should use a different browser. I followed their instructions but still couldn't make my deposit. After a few back and forth emails, I was ready to give up. Then, one day I happened in McDonald's and used their wifi. Bingo, it worked. So I guess my mobile and computer share the same network, so they ban my IP.