Bodyman Questions B S or not

Any bodymen out here ? The question I have is how does a bodyshop repair a new style plastic bumper ( fascia ) And is there a core on them? I have a 2014 RAM , got in a fender bender and the other guy's insurance is paying , told me they work with a particular in my area. So I took it there to get repairs made, told them I wanted a NEW Fascia not to putty up the old one. And I wanted the old one since they asked if I wanted the old parts back. NOW the lady tells me they replaced the fascia and had to send the old one in for core!! Sounds like B S to me.