Friend, as long as the company bought you old-age insurance and medical insurance in the past, the company can't cancel it, because the old-age insurance and medical insurance are paid once a year and handed over to the local social security department. Everyone has a personal social security number. Please check with the original company. When you work in another company, you usually only pay your future insurance. If you pay back your previous social security, that's good!

Extended reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.