Have a good understanding of Australian immigrants

Why cheat? I won't explain this. Immigration didn't tell you directly, but you refused because you knew you cheated. Why did you dig a hole and jump in? People value credibility, so you just made up an excuse, but you admit that you lied. If you have a bad reputation, people will think that everything else about you is fake. Don't think that you can change by knowing your mistakes.

Just pretend you don't know anything, and the immigration department won't ask you why you lied at first, because they don't have any real evidence. What you said at the beginning, go on. After the re-inspection, different immigration officers have different opinions.

If people accuse you of lying, it means that they have evidence, which is basically impossible. You can try other ways to immigrate. Change your country, or change your visa application.