UB deposit

[What?]

Tried using debit card a couple of days ago. Message came up Pre-Authorized but no money is deposited into your acct. With a number to call for explanation and e-mail address also. Waited on hold forever. Gave up. E-mailed them twice no reply. Anyone know what this means. Debit card doesn't work with gambling sights now or something else? I have used the same card before with no problems about 2 months ago.