The water bill shows that it has been paid, but I haven't paid it yet.

Dear, I checked for you, and my water fee has been paid, and the reason for the arrears is also shown: if the water fee was paid only a few days ago, I would like to remind you that it may be an operational error of the hydropower company. The water company will send you a reminder message when you haven't received your water bill, but this message will usually be delayed for about 5 days, so if you just pay the water bill and receive the notice of arrears within two days, it may have been sent before, so ignore it. Another possibility is that the water pipe from the tap water meter to your home is leaking or connected somewhere else. According to the laws and regulations of tap water, the tap water company stipulates that the monthly water consumption of each household is less than15t [including15t], and the part that exceeds15t is charged as per ton of 5 yuan. In order to save water, a water supply company adopts the following charging methods: if the monthly water consumption of each household does not exceed 15 tons, each ton of water is charged according to 2 yuan.