AT&T Universal Card Closed account without notice, 12 year customer Internet

I don't appreciate being mocked.  I have done "everything" correctly by the standards that had been around the last 13 years, obviously the closing account trend is recent, and has been occuring more this past year.  Not everyone uses all credit cards they have open, and no others were closed on me in the 15 years that I've had credit cards.  My credit score is very high so i really wasn't looking for advice, but thanks.  And to answer your question as to what i expected, i already stated what i expected, and that was a letter in the mail stating that the account WOULD be closed if the card usage remained inactive.  Not simply a letter stating the account had been closed with no option.  As a 10 year customer, this is a lot to ask?, I don't think so.

"I am very angry that I try to do everything right to maintain excellent credit"

  Well, not "everything".  One of the basics is to use an account regularly to maintain a record of on time payments in your credit report.

  Why should you expect a bank to indefinitely hold open a line of credit that you don't use?  It costs them money to do this.   If you have any other stagnant accounts like this, you should start using them right away.   Banks are cutting their losses these days and dormant accounts are very high on the list.

Hadn't used the card in two years, preferred using another card, but would have used this one again had I known it would be closed.

When was the last time you used the card?