It seems that Metaspins has some explanation to do with this. Are you sure that you are the only one who have created an account using the IP address they have detected? Are you using a VPN or something that change your IP address because you haven't mentioned it on your accusation. Receiving a welcoming bonus doesn't mean that you pass from their security checking, Most of the time casino only block gamblers during their withdrawal process.

You should make your own thread on Scam Accusation Board so that your case can see by other members and has a proper format for it to be a valid scam accusation against them.  You don't need to make multiple post about your case, Only a scam accusation on that board is enough to be noticed.