Unsatisfied with explanation on food portion

My wife and I ate at BOSSA Buhrein on the 19th Oct, we ordered steak and chips that we normally order at any Bossa. We literally received 8 chips each, upon enquiring from the manager we were informed that the portion of chips has been reduced due to head office trying to save on food cost. This is not fair as we are still paying same amount of money for reduced portions.