public void SaveCall(Call call)
{
if (_calls.Contains(call))
{
var oldCall = _calls.Find(el => el.Equals(call));
_calls.Remove(oldCall);
var oldCalls = oldCall.GetCalls();
oldCalls.Add(oldCall);
call.AddCalls(oldCalls);
_calls.Add(call);
}
else
{
_calls.Add(call);
}
}