Does Huawei charge for refusing to answer SMS by phone?

There is no charge for Huawei to call and refuse to answer SMS.

Incoming call rejection only means that the system blocked the other party's call and did not send a text message, so the SMS fee will not be deducted. If the other party keeps calling, you can turn on the interception setting and turn on the "Reject incoming SMS" function, so that when the other party tries to call, it will send SMS to the intercepted number at the same time.