Some unit inexplicably paid me social security.

It may be that Dalian Sheng Da Labor Service Co., Ltd. stole your ID card information. The company has the task of industrial injury insurance, so it gave it to you, but it didn't stop you, which led to your failure to apply for new insurance. Supposedly, you should be paid a month's salary, and then you were stopped. I didn't know there was something wrong with their link. We often have this situation here, that is, after stopping, we still can't participate in the insurance normally. If we don't know how to get it down, we can do it again. Actually, I think the social security center should know where this company is. It is likely to be a shell company registered by its regular unit and registered to complete the above tasks.