Sorry to hear bud,this has happened to me too in the past. However, if u do leave NEG feed, be prepared cuz he might lie threw his teeth and say that everything was in perfect condition, and than leave u NEG feed as well.
hope this helps u with ur decision , and again sorry to hear about ur bad experience .
VFC HK 416
HK Umarex G36kv
WE Glock 17