That's not true. Autosaver works on a scheduled date based on the cycle date of the account (date is determined based on what day account was activated, the actual recharge will be in account 3 days after this date). If you run out of money before the next top-up, Autosaver won't recharge until the next scheduled date. You can recharge on your own in between, the Autosaver will still work on the next scheduled date.if you run out of $ before the end of the month, the phone is automatically topped up
Also, be aware with Autosaver if your credit card is rejected three months in a row your number will be deactivated, so if your card changes (even just the expiry), you need to update the information by calling in and speaking to an agent.