where does it say that in the ‘rules’ mate? It states that you need to apply in x country but not that you need to be there when DTV is issued. Obv talking online here not in person applications
So you showed immigration a return ticket(maybe fake or temp one) and you didn't think they would note it in the system? You then didn't leave on that date and expect an extension. You are trying to scam the system and they have caught up with you thankfully. Get a proper visa or like they said get out!