I used to tell everyone that eco-bici was one of my top 5 favorite things about Mexico city--up…read morethere with lucha libre, tacos, and mezcal. However, after getting a year-long membership, and using the bike every day to go from De Valle Norte to Condesa, my card stopped working one-day. and I thought nothing of it... I just started using my partner's card (she never used it). We finally called to inquire about a month later and I was informed I owed 8,000 pesos, or almost $400 USD. They claimed I didn't return a bike for 24 hours. It was the exact same route between the exact same two stations I always used... and I waited for the red light, then walked away... and that's what I did every other day the entire year. However, their holder didn't properly register the return on this trip, so instead of taking the blame for faulty gear, they blamed me for "not tapping my card again at the end of the ride"... which nobody ever does. Even after talking through my ride history, how I clearly didn't steal a bike, and how a 1000 peso fee or something would be annoying, but less unbelievable, they stuck with the fine--8 THOUSAND PESOS. I genuinely can't belie how they handled my situation, how much friggin' money they wanted to charge, and I will now consider them one of my 5 least favorite things about the city. 1. Eco-bici 2. Traffic 3.... I dunno, I love Mexico City, but eco-bici can kick rocks.