Give them crap for it when you see them again. They'd definitely owe you. If you mean what do you do right after they take your bike, you have to walk to the nearest location spot where someone could pick you up. Then call someone on your cell phone. Or walk to the nearest gas station and use the phone there.
Do you need suggestions on how to get to the wall? Most cabs can take you there and work late. It will cost you about 200-250 depending on what section of the wall. There aren't any regular buses running at that time. Also if you want you can call a driver if need be, but they will probably be the same of a cab.
www.localnoodles.com - Beijing User-Generator City Guide
An early bicycle propelled by pushing the feet along the ground while straddling the vehicle.
? Bike was valued at 154.00 and paid by insurance claim...
Kinetics in Glasgow seem to sell it.