My social security is pinned on the company I used to work for, and now I want it back. The person in charge wants to pay back my social security. What should I do?

You don't work in that company now, but you pay social security? Is that what you mean?

In principle, after you leave your job, the company has no obligation to help you pay social security. It may be because some relevant personnel of the company failed to help you stop paying, so the company has been helping you pay social security since you left your job. It stands to reason that the part that the company sent you in the past few years after you left your job should be borne by you personally, which is why the company wants you to take money. Legally speaking, the fault is not that you should not bear the corresponding consequences. You'd better negotiate with the company and bear part of the expenses appropriately. Of course, you can also solve it through legal channels. Article 50 of the Labor Contract Law

The employing unit shall issue a rescission letter from the date of rescission or termination of the labor contract.

Or the certificate of termination of the labor contract, and handle the transfer procedures of files and social insurance for the workers within 30 days.

Therefore, the relevant responsibilities should be borne by the company.