I have the US$497 plan and I have switched on rebilling for my clients. I have given each client an amount of complimentary platform credits that DO NOT rollover each month. It seems that when a wallet is initially created, it's loaded incorrectly and this error is not rectified in the months that follow. I've made a video detailing the problem (5 minutes): https://www.loom.com/share/f01b438b22ce4deba1f91ed173857ea2