The available balance of China Unicom's mobile phone is more than 40, and the credit line is more than 270. Why did you receive a text message saying that I have insufficient available lines and will

The available balance of China Unicom's mobile phone is more than 40, and the credit line is more than 270. Why did you receive a text message saying that I have insufficient available lines and will stop at the beginning of next month? Because you owe money, it's simple. The available balance in your account is your own money, only 43.75 yuan. Your phone bill this month is 7 1. 1 yuan, which is obviously not enough to deduct. I didn't stop work before because your credit line can overdraw 270 yuan, but the 3rd to 25th of each month is the payment period. If the arrears are not paid off during this period, the arrears will be suspended on the 26th.