Who called from 9313054347

sales to  sign up for a different phone,internet provider and computer but didn't get call back or verificatioy

did not have me sign my name and just took my debit card number

There are a lot of scammers that pretend to be AT&T, or pretend to be contracted by AT&T.

Go to the bank that issued your debit card and tell them what happened and have them check for any transactions against your card number. You will need to cancel that card number and get a new one issued to you.