BICYCLE, 21 SPEED ROAD BIKE, GMC DENALI, BRAND NEW in Arnprior, Ontario for sale

I bought this bike recently through Amazon and paid over $600. It's too tall for me, and they want $100.00 to return it. It's brand new with less than a ½ kilometer on it. GMC Denali 700C 21-Speed Road Bike has a lightweight aluminum road bike frame. Alloy calipers and brake levers and the high-profile alloy Vitesse racing rims. Shimano Revo shifters allow you to shift without taking your hands off the handle bars. A Shimano derailleur drive train for quick, smooth gear changes. Includes alloy water bottle cage. * 21-speed road bike features a lightweight aluminum frame * Alloy side pull brake calipers and levers. High-profile alloy Vitesse racing rims * Size suggestions-medium- 5.8-6.0, * 36 Spoke alloy nutted wheels. 21 speed shimano twist shifting * Shimano derailleur and Shimano Revo shifts makes it easy to change gears quickly and smoothly * High-performance 700c tires * Item Weight: Approx. 13.2 Kg * Brake Type : Mechanical Rim * Color: Black/Green * Size: Medium