If the old and new strata managers worked together correctly, then your levy history would have been transferred to the new strata manager.
Your levy history is kept of a levy ledger. You can ask to see it at any time. Id ask to see it to make sure that all payments you have made are credited to your sccount.
Its an unfortunate situation that you are in. As JT suggested you can ask to be put on a payment plan. But a payment plan is not a way to defer your levy payments. At some time you will need to show that you can catch up and manage your levy payments as they become due.
Perhaps a financial counselling service offered by some charitable organisations would be of use to you to plan a way ahead.