Bad service

Was in a que to be served, after waiting for 10 min and it was turn to order, the cashier told me to wait as she had to check on the chicken. Upon her return I was told that she hopes I order a two piece as there were only 2 pieces of chicken left. At that time I wanted 9 pieces for my family. It was at 6:30 and the closing time was at 8pm,so what are they going to serve other customers. I complained online on the same day, the following day the customer service agent told me the manager will contact me and still haven't heard from them