Bank of America closed my credit card without notice

Bank of America closed my credit card without even sending me a notice!
It was my backup credit card and I didn’t use it very often, didn’t carry any balance. I had $15000 credit limit on that card and kept it just in case of emergency.I had this card since 2001.
Two months ago I moved to a new location and instead of calling to Bank of America and changing my address over the phone, I decided to charge the card, get a bill and change my address in there. To my great surprize the card didn’t go through! The cashier tried two times and it didn’t work. How embarrassing was that! Finally I had to use my regular Charles Swhwab credit card (with 2% cash back).