My boost auto recharge didn't happen when it was suppose to the other day either. Contacting them on their website is useless however if you contact Christine Lazona she gets onto things straight away. You can either email any problems at info@boost.com.au or christine@ boost.com.au
When I lost all my data I just recharged with $20 and got 5G. I usually get the $30 one. Anyway they have manually transferred 20G over so I'm happy now. Hope this helps peoples!
I have no idea why it suddenly stopped working but just letting you know how to fix it and get on with your life Hope this helps and have a great weekend!