Adventure in busing or if it says Mega

[peddler665]

Why the He## does it not go to Mega?
Left my apartment just off the Presa yesterday mid morning. Waited at the bus stop & soon a bus with a number of destination listed on it's windshield including MEGA my preferred destination. I board paying my 5 pesos.
Past the ball park into the subterranean street BUT instead of going to the left leading to the tunnel that comes out near the Mega it took the tunnel to the right coming out what was obviously the area behind the University. As we went along I saw the back of The Peace Plaza then into an area I recognized as where I caught a bus to Delores Hildalgo two years ago. Then down passing the Commercial. Should I just get off foregoing the Mega? But what the heck it is an adventure!
Soon zipping pass the Frog Park so I am thinking Aha! We heading the right way.
Alas we are soon heading up into the hills eventually arriving at Plaza de Toro (I beleive) where the driver turns around stopping at a nearby bus stop ordering me off the bus! I protest pointing to the Mega sign to no avail. So off I get while he takes what may be his break, lunch hour or whatever.
After a few minutes another bus marked "Presa" pulls up. Dare I get on risking another 5 peso sight seeing Journey? Just then a empty cab comes by & I hail the driver telling him Mega Por Favor.
I am soon at the Mall my original destination.
So my question. IF IT SAYS Mega Why does it NOT go there?
Anyways a cheap tour.