Someone had a similar problem at a show with Fujifilm
Dealer was advertising double cashback, but Fuji didn't know anything about the offer
In this case the buyer was fortunate that they found photos taken at the show with the double cashback offer sign clearly visible
Eventually it was settled, not sure who paid up, but the buyer got the rebate as promised
Does seem that comms between manufacturers Global, Regional arms and dealers it pretty poor across the whole industry.