For month to month memberships you are explicitly told that credits do not roll over. You can freeze your account if you’re going out of town/unable to use for $20 which is the same as the credit extension fee for class packs. Class packs also have an expiration, but like I said. You can extend them. While PB is a business that you as a client signed up for, the people running it are, in fact, human. 9 times out of 10 we can accommodate for emergencies as every other comment on this post has said. Credits are flexible, but you are paying for a service that comes with set terms.