Poor service of food

Today I bought a Colonel burger the usual meal I prefer, I waited 5 and a half minutes for my food through the drive-thru, when I did receive my food I drove off and noticed my mash and gravy was not there I turned around to go back for it. When I finally got back to work I saw the chips were clearly fried in old oil because the chips taste hollow and are slight brown in colour with a few black spots on it clearly not how its supposed to look. Very irritated I do not feel like going back to that KFC wasting already my time and petrol. I have always been a regular customer for more than 5 years and never have I seen this standard off food quality.