World of tanks's mobile phone bill is paid until the account is recharged, and "SMS verification code failed to be sent" is always displayed. What happened?

The problem of their server has nothing to do with the mobile phone operator. It doesn't matter how many times you refresh it, day and night. Just lying to dad's network. For example, I've always wanted to open a mobile member of world of tanks, but every time I send a verification code, I can't get it on my mobile phone. I've tried n times. It's really a cheating network, far worse than Tencent.