private void PayHandler(object sender, IUser user)
{
if (!_disconectedUserCollection.Contains(user)) return;
var sourcePort = _ats.PortsMapping[user.Phone.Number];
_billingSystem.UserPayDateTime[user] = TimeHelper.Now;
_ats.PortsMapping[user.Phone.Number].RegisterEventHandlersForTerminal(user.Phone);
_ats.RegisterEventHandlersForTerminal(user.Phone);
_ats.RegisterEventHandlersForPort(sourcePort);
user.Phone.RegisterEventHandlersForPort(sourcePort);
user.Plug();
_disconectedUserCollection.Remove(user);
Console.WriteLine($"Abonent : {user.Phone.Number.Number}; Pay for his phone. And can resume calls.");
}