Let's not get carried away. . .
Let's not get carried away with the Colombia bashing. I'm just as frustrated as anyone else with the flakiness and the bs. But the truth is for the daily, superficial, basic interactions I find that Colombians are mostly polite, pleasant, even helpful. MORE so than other people!
It's just that when your requests or their promises start to get more complicated is when you run into problems. When you hear a chica say "maņana" (tomorrow) or "despues" (later) then just assume that's probably not the case. :) Don't take it personal, it probably has nothing to do directly with you. I suspect in many cases, it's not even done intentionally or consciously, this stuff is working on the instinct or subconscious level. So it's not entirely their fault but there are reasons for this behavior, based on social, cultural, and historical factors that I really don't want to get into right now. But if you know anything about this country's history, trust between the social classes and between certain other groups is somewhat lacking.