I can confirm you have been incorrect, although you've been providing better customer service than the regulation requires.
If you don't have that written confirmation (after notifying the customer that you need it within 10 business days to provide provisional credit), you do not need to provide provisional credit. You do have to pursue the investigation, however, and it should start right away (not waiting for the written confirmation).
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8