Toughened Glass Smashed?

I have just had delivered a sheet of toughened glass. It was fine on deliverly (so I signed) but when i moved it it smashed. Surely this shoul dnot have happened. I called the company and they basically said tough luck its glass what do you expect. Whilst I appreicate that glass gets broke surely toughened glass is stronger and so should have not broken so soon.
Does anyone have any suggestions? or has this happened to anyone else?