1. Since the imterimstay is not extended anymore the lower court can proceed with the trial.
2. Hence you will have to either extend the stay order or get the matter finally heard by the high court.
3. Your lawyer is not right. Since it is not extended further on its expiry it can never be deemed to have been extended.
4. So file an application of extension of stay or f it is already filed then mention the matter for its hearing.