False advertising on Mochachos Menu

I ordered Monday special on UberEats for Mochachos buy one get one free on chicken burger then Ghandi square restaurant (Beauty) calls me saying they can't continue with the order because it's invalid from them since it's no longer existing. They ended up cancelling my order. UberEats consultant calls me confirming that they are indeed canceling my order and they can't do anything. I am so not happy with false advertising and that they actually just sorry with no solution