Worst customer service

Took the kids (twins) there as it was their birthday and birthday wish so they can sing cause they saw videos on TikTok trending, as we were there for a gateway and the accommodations we booked was 5 minutes away, we took them there, as we walked in we saw the stuff singing for the other family so I have asked them if they can full fill my girls wish to sing for them, they agreed, so we sat order our food and ask the waiter to bring the food together with the drinks, he brought food we ate as we finish eating that’s when he brought the drinks, I asked why are drinks so late as we were now planning to leave cause we were tired and just wanted to leave he said he placed an order on time but there was a delay on getting the drinks on time. But overall your service is a bit slow cause we waited for quite sometime and was extremely disappointed as they did not full fill my request cause while I was asking them even one of the male waiter made a joke that how much are you going to pay if we sing, now I’m starting to wonder whether it was a joke or not, cause their promise was not fulfilled. That’s the worst service I ever encountered and the stuff are not friendly, they looked tired, but don’t understand why we getting such horrible service cause they are tired, that’s why they could not fulfill my request actually birthday wish as it comes once a year, everything on they list was ticked except the single part. This took place in Riverside Mall in Nelspruit