ignored it also

I never answer it, but I do get at least one call a day.

calls daily.  Robo call asking for person not known.  Get a clue Robo dialer!

Claims to be a debt collection.  Gave an address that is 5 yrs old.  Said I owe $1700 due from AT&T.  I havent been with AT&T since it was called Cingular.  Says I authorized use of my acct with 3 az numbers attached to it.  As far as I know, not possible to have my number active on two different carriers.  Says he is sending me something in the mail since I dont know the person that I gave access to this account.  Nothing adds up.  Next stop is ATT store

Also, wouldnt I have received something in the mail?  It would have been forwarded to new address...and I havent seen anything on credit report yet either.