Communication department, post office. Here you can order a call, send a letter, a parcel or a parcel. Convenient working hours. The staff is friendly and polite, they will tell you where to go and will be happy to help.
Due to the difficult situation in the city, the post office is periodically closed, as for example now. And how to get letters or pay for communal services, you have to go to the main building of the BSI.