Can't return social security. If you negotiate with the company again, the company still can't give you a refund policy, so ask Longhua's social security bureau to coordinate. Companies like Foxconn are afraid of employees going to the Labor Bureau and Social Security Bureau to complain.
Another suggestion: If you still want to work in Shenzhen, don't return the social security. When you arrive at the new company, just let the new company renew the fee in your original social security number.