Social security should ask the local tax, 12366. I have called several times, but I can still get in if I am willing to wait. As for the address, which district's local taxation bureau is Baidu's, and if it's social security, it's necessary to go to the branch directly under the Guangdong Provincial Local Taxation Bureau.

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