When I apply for a Korean visa, I will call back and ask the name of the company. I gave the wrong answer. Will I refuse the visa?

Your answer may be wrong. Generally speaking, others will think that you are lying on purpose. From a practical point of view, you did lie, and it is impossible to return the company name to Dai Li. If it's a small mistake, you don't say it's another company, that's fine. They also want to investigate the origin of your company and the stability of your work.