Phil100375

Hi I need help! We have just bought an 06 C4 hatch and absolutely love it already. We needed to fit some roof bars so I bought some new ones from a car parts supplier on E bay. I couldn't get the bolts to screw down enough so contacted the supplier. They told me to check the size of the bolts and put some WD40 in the fixings first. I did this and got the bolts fitted on one side, perfect! Well not really as when I took them out the bolts they snapped off leaving half the bolt in the car. What do I do now??????? Please help Phil