Hi,
I work in the Town Planning Department in Manilva and we also have a Cadastral office to deal with Malaga and they said that the letters have already been sent. The problem is that they might have already been returned as nobody picked them up.
I spoke to a few owners who came to our office and we tried to calculate the difference in reduction and is about 100 euros/ apartment. Probably not all are the same.
I suggest you speak to AEA and assign a representative to go to Malaga and collect them all and ask for the reduction in the IBI office in Manilva. The 2012 IBI is already issued with the new amount discounted, but you can still claim back the 2011 one.
Regards
Valentina