Extremely Poor Service

We ordered dinner from the Lifestyle Crossing Branch on Sunday evening and had already paid for the meal when we realised that there was a portion of Pop Prawns missing. My boyfriend then phoned them(Which now goes to a call centre!!!) and a lady answered who continued to put us through to the branch and the call kept going unanswered. This was for about 20 minutes. The lady then told us that we should phone in the morning to speak to the manager. All we wanted was the food we paid for and did not receive. We finally left our phone number for the manager to give us a call then next day and to this day we have not received a single phone call. I am highly unsatisfied and will not be returning to Fish Aways which we use all the time by the way