Accidentally found this hack yesterday, not sure if I was lucky and if it works for everyone.
I have this sim on 365 days validity given to my parents overseas. When they come to Oz, its easy to co-ordinate with them at the airport and after. To keep the sim active, I would top up the account with $10 every year.
Hack- Yesterday, I changed the payment method (from Paypal to Debit card) and without making a payment of $10, the validity got extended by another year.
Hope this helps someone.
@Admin- please remove the post if its not appropriate for a deal.
Thanks for posting.
It will help Amaysim close the loop hole.