After twelve years of work, the company bought two years less social security.

According to the labor law, enterprises must pay social security for employees if they have been employed for more than three months. You have worked in the company for 12 years and only paid social security for two years, which is illegal. You can apply to the Arbitration Commission for arbitration, or you can report to the labor inspection brigade, and ask law enforcement departments to help safeguard rights.

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