Hi Matt Hooper
Thanks for reaching out to Microsoft Q&A.
RA-GRS to LRS replication change will take 30 days' time to reflect in your billing.
Reference (Please review the FAQs): https://azure.microsoft.com/en-us/pricing/details/storage/blobs/
And here are the charges that incurred when you change a storage account replication from LRS to RA-GRS
In case you have changed the replication 30 days ago and still billed for RA-GRS, I would recommend contacting Azure Billing Team, Billing and Subscription team would be the best to provide more insight and guidance on this scenario: https://azure.microsoft.com/en-us/support/options/ (it's free support. )