Royaloak Furniture — Installation is incomplete

I have purchased computer table in royaloak furniture and they have delivered it and after which technician came and started fitting it. he realized that screws are missing in the package and they told give me one day we will install tomorrow. its been more than 5 days they haven't turned up. I follow-up over calls and chat and over whatsapp no one responses over it. they have only one customer care which is very rare to get the executive. These people are very reluctant towards customers. I dont know " where the FOUNDER or this ROYAL OAK sitting??" i think he never cares about customers.