Does water in the sink drain slowly or stand still, with a smell coming from the drain? Clearing blockages is one of the things this plumber does. Tell them where exactly the water will not go down: the kitchen, the bathroom or somewhere else in the home.
First check whether water drains in the other sinks and mention it to the plumber. Clear the space under the sink and put a basin there.
We would appreciate it if you mention when calling that you found the plumber on madloba.info.
📝 Have you already called this plumber out? Describe on madloba.info how they handled the task so other people can decide whom to call.