lack of service from customer care

At the end of October last year, my wife and I went to M & B in Rosebank Mall. We ordered 2 cold sandwiches. After 30 min the order had not arrived. We inquired as to the delay and was then brought 2 sandwiches We had ordered the salmon trout with cream cheese and chives. When the meal arrived, there was the smallest of slivers of trout, NO cream cheese (mayonnaise only) and no chives. Instead of telling us that they had run out of supplies they served us this unacceptable dish. WE refused the meal, paid of the drinks and left. I subsequently laid a complaint, but heard nothing., I then twice received SMS saying the matter had been resolved - without me ever hearing from them. Despite further phone calls to the customer care centre and promises to re-escalate the issue, and a call from a franchise manager, I am still awaiting a call from the restaurant! So much for customer service.