Jetstar: How to Check (Revised) Validity of Credit Voucher Issued in Feb2020

Wonder if validity of jetstar voucher issued in Feb (non covid) too has got extended or not. I have around $600+ vouchers issued on medical reasons in Feb2020.
Is there a way to chat with them…. cant get thru their phones / chat just reaches 'Jess' and stops…

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Jetstar Airways
Jetstar Airways