repair core

I ordered a gold bump cube on amazon recently: http://www.amazon.com/Cubetwist-3x3x3-Golden-White-Mirror/dp/B006UWD80Q The reviews it has are both good ones. However my cubies are really loose and the cube locks up severely when trying to solve; like lock-ups so bad that cubies feel like...

Last week I dropped my two year old store bought Rubik's brand cube and the core cracked and is now in two pieces. Has anyone had any experience with this? If so, were you able to repair the core somehow? I would like to return the cube to useable condition (casual use) but don't know if that's...