Is it illegal for petitioners to make phone calls and send WeChat messages to administrative agency staff regardless of day or night?

It is generally not illegal.

So if the administrative staff of the agency are involved in work that requires a lot of communication with residents, they will generally be equipped with work mobile phones, so that they can separate work and personal phone calls, and will not affect their personal phone calls after get off work. time.

Of course, no matter how annoying the person is during working hours, they have to be dealt with. The effectiveness of the treatment depends on the individual's working ability. You cannot blame the residents by saying that your working ability is not good.