Castle Bay Sinks

I had a Castlebay Paris 50/50 sink installed in Aug 2021. Sink leaves water in the bottom, but I love the ledge in the sink where I can put a cutting board. I have been extremely disappointed in the company itself. The two sink tailpieces were too large in diameter and would not fit into standard plumbing drains. I had to buy replacements at a plumbing store. I would of thought their quality assurance would ensure their equipment fits into standard plumbing fixtures. I sent them 5 emails and website "leave a message" notices. Not once did Castlebay contact me to discuss the issue. Their customer support is terrible/ non-existent.