Jeff,
Bills sent by the council never reached me. I'm only here every 4 months or so. It seems uncollected post (not collected within two months) is thrown away (by AEA?). It would help if AEA did not throw it away but I guess for some properties it would become a mountain of post.
Banco Popular did change my bank account number (due to a bank merger) but I have direct debits for electricity, community fees and water. None of these other DD's were affected by the account number change but it could be because these are all more frequently than yearly.
Very frustrasting to have set up DDs for everything and then to find council sting me for costs and interest for 200+ euros and the first I know about it is a third reminder for the 2009 bill.
Interestingly I saw lots of these 3rd reminders in the post room for other people. Example, for a neighbour (owner) who tried to sell and is now gone. There is, I think, a time bomb ticking here that is yet to explode through the property market.
I have paid bill (collected from council) at the bank. Tomorrow I will go bank to council to get the DD set up AGAIN and start the quest to see if I get the interest and charges credited. All part of the fun of living in Spain and only getting about 1/10 of the post one should get.