That kind of money can be paid at all Dagong service points (district service offices, banks, post offices and convenience stores). However, the supervision letter was sent to you personally by the district service office in the area where the card is located, indicating that you have not paid the previous insurance premium within the time limit, which is urging you; This kind of form can only be handed in where it says regional service office. Bring enough cash+old insurance certificate+payment bill+supervision letter on the day of going, and bring a seal if you are not at ease. Some places directly provide pens for you to sign, and some places need to be stamped.
This story tells us that after receiving the insurance bill, if you have enough cash on hand, you will go to the nearby convenience store to pay. If we put it off, things will become troublesome.