Look what I just received:
"Due to a recent issue with the USPS billing process, your store received one or more unexpected shipping label adjustments for First Class Package shipments between July 4 and 5th. This issue is now resolved and is no longer impacting orders on your store.
We are pleased to report that as a convenience given our business relationship, we will apply a refund of $— USD, which is equivalent to the unexpected USPS adjustment fees incurred. No further action is required. Refunds will be returned to the payment method used to pay for the invoice with the charges within 7-10 days. You can see this reflected in your admin Settings on the Billing page under Recent Bills. By accepting this refund, you agree that Shopify is not responsible or liable for any amounts or claims related to any aspect of this matter.
We apologize for any inconvenience. If you have any questions, please reach out to our 24/7 support team.
Emphasis added by me. Looks like we scared them into action finally! Glad I’m finally getting my money back, but I feel awful for all the people who have to wait up to 10 days for their $5k or $10k. At least it’s a refund and not a credit.