Unable to withdraw

I withdrew on August 10, and it could be credited to the account on August 12, but on August 12 it was said that the system was upgrading and the fund could not be withdrawn. I was required to resubmit the data for authentication on August 12. I withdrew again on August 13 and the system was under upgrading again. It was said that they would handle it on August 19, but it wasn’t credited to the account on August 19.