When you say insurance intermediary company, you should mean insurance brokerage company! Insurance brokerage companies are responsible for comparing the products of various insurance companies, and then tailor-made according to the needs of various users, recommending the most suitable insurance products or recommending the combined products of different insurance companies, in order to enable customers to obtain more affordable protection at more affordable prices.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.