You haven't been banned for 6 months. If a Thai tried to go to your country he wouldn't get very far because of international visa requirements. Though he also wouldn't be banned.
No, not a 6 month entry stamp. However, I entered the country amd did not leave for 6 months as thry were offering exte tiomd internally at immigration. Without leaving the country. It.was never thst easy before or since. I can assure you that was the case. 100% fact.
Think about it... it is impossible it is legal. As if any country would allow this. As if your counry would allow this. So that means you are in illegal territory here, that means anything can happen. No matter what answers you get here.