First time I hear about that! Haven't talked with my Colombian friends in a while, but regions are indeed getting stronger differences every day although it is mostly with the marked s, c, g, h, j, r sounds, rarely with the vowels.

Anecdotally, I've never met a spanish speaker from any country (Colombia included) that pronounces the "e" as "ey" though, so it's interesting to think how that can happen. For context, tv and people in general use that pronunciation to mock (in a satirical way) English speakers trying to speak Spanish.