public void PutPhoneOnRecord(object sender, ContractConclusionEvent e)
 {
     PhoneManagement.PutPhoneOnRecord(e.PhoneNumber, e.Tariff);
 }
 private void OnReportBillingSystemOfNewClient(ContractConclusionEvent e)
 {
     ReportBillingSystemOfNewClient?.Invoke(this, e);
 }