Yes indeed they would have, as I finally did, too, discovering, as noted by others elsewhere, that Verizon has these 3rd party retailers masquerading as Verizon stores.

Meanwhile, I sent the paperwork showing the fee line (not omitting it, as one might expect, if they were't allowed to charge it, nor noting anywhere that it would be due later) to Verizon customer service and to legal.  I'll wait for a response from them. Yes, I anticipate that their response will be "customer is wrong again," but I'll wait for that, then decide whether to take further action with others who have contacted me, or to finally switch carriers.