Corps provided the laid-off workers' pension insurance that we reissued in 2008. Why are we included as individuals from 20 19?

No, the former temporary workers have no seniority, and the unit has no obligation to participate in endowment insurance for you. Of course, if you become a regular employee of the original unit, that is another matter.

Later, you were laid off 15, so you were laid off around 1997. At that time, pension insurance for individual industrial and commercial households had been carried out in many places. You have no insurance.

Then in 2002, the endowment insurance for flexible employees and freelancers was launched. You shouldn't have insurance yet.

After 2008, with the Labor Contract Law, it is stipulated that temporary workers are also a kind of employment and should participate in endowment insurance. At this time, you belong to the post, that is, the unit no longer uses you. So the unit should not insure you.

So the original unit can't list you as an employee, and there is no file material, so. You can't reissue the old-age insurance as an employee of the original unit.

You should immediately participate in the endowment insurance for individual industrial and commercial households, flexible employees and freelancers. In this way, only when the accumulated payment is 15 years and the legal retirement age is reached, can you enjoy retirement benefits. Of course, the retirement fee will be quite low.

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