Camec Triple Lock Door Trouble

Has anyone had trouble with their door pins ... they are the ones that hold the outer door to the inner door. There are three of them, they are about 40mmx30mm, held on by two Phillips screws and have a barbed pin that hooks into two round wires in the three door latches.
To test if they are holding make sure the two door halves are together and close door. Place fingers at outer door edge and pull out, dont force ... two of my three door pins dont hold even with light pressure they come apart.
Bushtracker referred me to Camec .... Camec have said " The door might not be installed square and the diagonals must be within a mm or two. I believe that there is more leeway than that but that is their line. My door is fitted square and shuts and locks perfectly.
The problem as I see it is the use of a plastic barb and round metal pins ... the square edge of the plastic bevels off and the round pin slides out easily. Maybe the pins come bevelled as there might be some injection moulding flash along that edge and is removed with a blade.
I also have to replace two of the three latches as some gorilla has over-tightened the plate screws cracking the backing plates. They have been like this from day one and I might as well do them now as I'm replacing the outer door pins.
Anyone had similar problems .... poor moulding and assembly being the cause ?
Anthony