Hi @Frazzled PM 
This can happen after a move but it should be easy to sort. Let’s try a few things:
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Set the patient to Denplan so prices are right going forward (Payment plan / fee schedule). This bit usually needs an Admin (Level 4).
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If the invoice is unpaid, open the patient’s Account tab and delete it, then re-charge under the Denplan plan.
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If the invoice is locked or has payments, unlock / unallocate first, then delete and re-issue on Denplan or, if you prefer to keep the paper trail, write it off with a negative invoice and allocate it to clear the balance. (Permissions for deleting/adjusting payments are typically Level 4 or a user with the right toggle enabled.)
Once the plan’s set to Denplan, future estimates/invoices will price correctly. Let me know if this helps! 
Thanks Saymon, I’ll give that a go.