False advertising KFC 21 piece chicken bucket is actually 17 small pieces, half full chicken bucket

Ordered a 21 piece chicken bucket, but only had 17 pieces of chicken in the bucket. So you don't get what you pay for. I paid full price and got 17 small pieces of chicken (bucket was half full) but was advertised 21 pieces of chicken. Is this not false advertising? You are shown a full bucket of chicken with a text saying 21 pieces of chicken, but reality you get a half bucket of chicken and 17 pieces of chicken. What a shady business model KFC runs. I hope your directors know this business model is not sustainable, people will get tried of being short changed.