BMC discontinued pay-and-park contractor overcharging motorists at Crawford market; citizen activists criticize lack of vigilance by civic authorities; private agencies given freehand to overcharge; BMC made parking free until new contractor appointed; overcharging issue has been ongoing for a decade; no strict vigilance by BMC; pay-and-park contractors not in official uniforms; parking rates not prominently displayed; Mumbai facing parking crunch and exploitation of motorists has become a norm.