The better question is this... How many accounts do you have? If they suspected STEELFOOTBALL was a duplicate, they would close it, iirc.
There are many reasons WGT will close an account. Perhaps a quick read through the Terms and Conditions would be a good idea.
Or, conversely, perhaps it was a simple mistake on their side.
Either way, an email to Customer Service at members@worldgolftour.com would be your best avenue to a resolution.