I still don’t understand what OP is referring to. One can actually buy Taylors Ruby Port (the famed Oporto shipper) for $12 or so (at least according to w-s free level) and LBV vintages for $16, so perhaps in a closeout bin it could have been the ‘real’ Taylors I would assume.
But I guess not if there is some industrial junk producer with the same name, rather inconveniently for the high quality shipper.
Always return to the retailer. If they dispute it and you have a receipt find a new retailer. It is important to return bad bottles so the numbers of flawed bottles is more accurate. Most retailers will then return to distribution who will comp that bottle.