220 UR5e kit bags contain 204 locating blocks

Stores counted 220 accessory bags for our UR5e handling jobs. Only 204 contain the locating block listed in each kit. Seller says 220 means pieces now, despite the invoice saying kits and their final confirmation listing the contents. We have kept the empty positions visible in the receiving count. I want the sixteen missing blocks supplied, not another photograph of all the bags together.