Sportsbet.io is a reputable gambling platform that is on a long run and still haven't had any lapses and accusations that lasts for a long time nor was proven by anyone. The only problem I see in this issue is that they've verified your account and looked it up on either their own list of banned users or external list of people that has issues and/or accusations with regards to money laundering and etc. I am not accusing you that you done bad things in real life, yet there can be instances that some users seeks to use online platform yet had been detected by such platform that that person has a bad history with regards to money or whatnot. Again, that's just my honest judgement and opinion.

Nonetheless, better be calm and just stand firm, as long as you know you never met the prohibition that they mentioned in the rule they pointed out their response.