Do all tourists have that same visa that you have on page 11? When I used to be a tourist, migraciones only gave me entrada/salida stamps. I've never seen that visa stamp for a tourist before. It's that visa on page 11 that is the problem. You need to get another one of those. I wonder what happens if you exit on the 27th and then re-enter. At the very least you should visit migraciones and get that visa on page 11 extended for another 90 days. The border official you met today had to write "hasta 27/08/2010" because that is what is on your visa stamp. Until that visa stamp expires, the border official must not override it with other dates. Have you ever had a visa stamp like that one on page 11 before? has anyone? Where did you get it? When did migraciones start giving those out?