Pathetic customer service

My girlfriend and I decided to have dinner at the Ocean Basket at the new Mall of Africa. Since she loves the restaurant. We sat to have dinner at 18:35 or so on the 9th of May 2016. At around 19:15 we were still waiting for our order, where other people who came in after us, got their food/order much quicker. I'm talking people in groups and other couples like us. It was not even a busy night like a weekend. At this point we were angry and decided to cancel our order and leave. One manager didn't even do anything when he saw our displeasure in the service, he just walked away asking the waiter to deal with us. Even paying for our drinks took a while after we decided to cancel dinner. The waiter did not know what to do, even brought us the wrong bill. We sent a formal complaint to Ocean basket directly and the response was standard but appreciated, which they confirmed the owner would call with a resolution. It's been almost two weeks and still no feedback. I did receive a call from someone calling from a private number from the restaurant last Sunday evening and I asked the person to call back in 5 minutes as I was driving. I am still waiting on that call as well. Shows how much they care for their customers cause no one called to follow up if the query was resolved.