The social security card was handled in the previous company, and I didn't get the card. Now I'm in another company, and now the company is

If the original company has already handled it for you, you can collect it from the original unit.

If you haven't done it before leaving your job, then you need to apply for a social security card in a new unit after you have been insured normally.

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