Incompetence from KFC

Ordered a Family treat, added extra Mask and gravy and Small chips because the family treat does not give it. I asked to change the coleslaw for mash and gravy but they denied me. Went home just to find that the Zinger wings was excluded from my order. I am not gonna drive all the way back to collect 4 Zinger wings, but yet I was charged for it. Poor service. This is not the first time this has happened to my family. I'm sorry but poor service from KFC.