Convergent Outsourcing, Inc. Sent collection notice for a bill with a wireless provider I have never used. Renton Washington

I was sent a collection notice dated for 9/1/14 from Convergent Outsourcing, Inc. The outstanding bill is with AT&T wireless for $222.63. I have never had an account with AT&T. Also, the letter is addressed to me using a last name I havent used since 2003 and an address I recently moved from. 

In the letter I am offered several payment options to settle the account; pay 50%, pay over 3 months, or over 12 months. I am also given several options for ways to pay; online, by phone or by mail.