Ady if you have the receipt for the camera purchase then that proves they screwed up the insurance details... If you do not have a receipt then this could be difficult.

How different is the serial number to the one supplied... Basically if the serial number is correct then you can prove a match to the model number. the serial will only correspond to your model.... If you never had to supply a serial number then these people are con artists

wwhat type of insurance is it product cover or just home contents as a camera is a portable device their offer could be considered more than reasonable