Legal consequences of a cheque case in a rental matter

My cousin who had taken flats has a criminal case and case filed at the Rental Dispute Centre. The landlord used his guarantee cheques (empty & signed) to file the criminal case.

But the amount is huge and not true because part of that has been paid.

Since he is overstaying because of this case, he plans to surrender to police and hopefully pay a fine or a short jail term, as he is not able to pay the landlord the amount.

Will the amnesty help his situation in reducing the jail term? Is the case filed with Rental Dispute Centre considered a civil case?

What if the case has been forwarded to court with a judgement of a 1-year term, will he serve the term or can just pay a fine?

By the way, the amount of 2 cheques was more than 200k for each cheque. What should he do to solve this problem?

Would really appreciate your prompt response.