I strongly believe OP isn't laying in this case and most probably the problem happened due to the broadband issue (realized from all discussion). As far as I know, there are two types of broadband connect shared and dedicated IP. A shared IP connection would be the same IP under a single internet service provider. I am not sure but the most likely website would detect such as connection as the same IP. Even me, I am using shared IP for my broadband. Because dedicated IP is quite expensive here. Since OP complied with KYC procedures and didn't cheat any other way, Sportsbet shouldn't ban the account due to IP detection. Sportsbet should ask also other accounts to verify, if failed then that accounts should ban either there is a fund or not.

I Hope Steve will solve this issue as soon as possible since you already aware of this case. @OP, just stay calm,  Steve is enough friendly to resolve such as issue.