I have no experience with this brand but suggest the following:
1: Remove the door and hinges.
2: Dismantle door by removing the inner liner. The screws to dismantle are usually under the door seal. Try to leave the seal in place on the removed liner.
3: Now access the interior
of where the hinge fits.
4: Make up a plate (sheet metal preferably stainless or thick aluminium) to fit over the inside area covering where the hinge anchors to.
5: Rivot this plate into place.
6: Re-fit hinges screwing through into the new interior
Hope this general fix helps... others may be more familiar with your particular brand..