Bad service and poor quality food

We made a telephonic reservation on a Monday for the burger special. The lady we spoke to confirmed that my partner and I could have two of the specials. When we arrived there, the first waiter also confirmed, but the waiter who brought the food said it is not possible. Our food arrived, the burger was so salty and the chips was fried in old oil. The waiter said it could be because we are the last customers. We sent our food back,only to receive more old oil fried chips. My partner and I was so disappointed that we just decided to pay for our food and leave, but ended up giving our food away to the parking attendant. I will never go to the restaurant again. Bad service and poor quality food.