Why am I getting unsuccessful / expired subscription emails when I just paid for it less than a month ago?

You might have two different subscriptions on the same beats.  For example, if you bought a track for Exclusive Rent, and a month later that subscription fails due to a missed payment, if you buy it again before canceling the first one, the first one would still try to charge again (failed subscriptions  automatically try charging again 10 days later).  So if your first subscription has an unsuccessful payment and you decide to re-buy it, you need to cancel your old one first by going to your orders page https://sfrbeats.com/orders, clicking on the old order, then clicking "Cancel License" above the track list.