Paid for 24 but received 18

On Friday the 29 September 2017, I decided to purchase a bucket of zinger wings, 24 at the price of R119.99.

When I got home I had counter the wings and found that I had received 18 pieces rather than 24. I as a consumer feel betrayed as I had paid for 24. This is unsatisfactory service and I feel as though I have been ******. Are the people who are working there keeping the pieces I was short of for themselves???