hi,
can you post some pictures?
I think that the supplier is not removed from liability until he resolve your problem by repairing/replacing the cills.
hi,
an aluminium/steel thermal break door may be more resistent (see GB EN 1627 classification)
and for the locking system you need an anti-bump, anti-drill, anti-pick security model (see http://uapcorporate.com/anti-bump-anti-drill-anti-pick-anti-burglar/)