Help from Cameraworld

I went there to sell a unused camera lens. Being a amateur photographer I thought the lens was something it wasn't. The helpfull guy Dereck pointed to me that what I was told when I bought the lens from another "reputable " camera dealer wasn't what it really was. And I overpaid for it. I did feel like a idiot but at least was told it wasn't the first time. I will from now on do all my purchases from Cameraworld. Any body should give them a go first before going to any of the so called big names.