Unsatisfactory customer service

Went to the restaurant at South Gate with my family ( two adults and two children) yesterday. The waiter who assisted is sipho. He had beed serving another table which was hosting a birthday party and had numerous guest coming in. He also attended to us and assigned a table for us. Once we placed an order.. He went away for about 20 minutes came back and informed us that he still waiting for our food whilst continuing serving the other table. He brought the first the drinks and we waited, then later meal for my youngest son. Then minutes 10 minutes later meal for my husband and older son. Then he went back to the birthday party while I waited for my meal. He then brought my side of creamy mushrooms but still no food. Until I got angry then he brought our meal. We constantly had to ask for salt, sauces because seemingly we were not being attended. After my meal had ask for a finger bowl then the bill. The finger bowl and sauces were brought by another waiter. He then brought the bill at the convience of his time. I told him I am not tipping because bad service made a note on the receipt. I paid my bill and he said he will ask his manager to speak with me. Then indeed the manager came.. I explained I was not happy about the service.. He apologiesed and asked if I had paid already... He fetch his book so I can write my details.. So that he could me on the weekend of the 13th. I mean the restaurant was not busy at all. It had normal amount of clients for me to receive this bad service.