Disassociated by False discount on Uber eats

I ordered the buy two burgers for the price of one burger from Fatboy burgers bromhoff on Ubereats on 07 November 2024 in the evening using uber eats. The driver only delivered one burger. When I asked if the second birthed he said he does not know about the special advertised in Uber eats. This is ridiculously poor experience and I would like an apology as I waited my family for super only to receive half the ordered items. Will never buy here again