may a bank send one provisional credit notice cumulating all the balances and one final resolution notice so long as the transactions are identified
Yes. The Regulation only requires that you correct the error(s). As long as the customer is made whole for all unauthorized transactions, lost interest, and service fees, you may issue one credit.
should multiple final resolution notice(s) be provided by bank to the customers to comply with the "within 3 business days of completing investigation" requirement
Again, the answer is yes. Some institutions will hang on to that final notification until they have heard from their card processor on every single disputed charge, but this does violate the 3 business day requirement. Once you have enough information to make a determination on one or more disputed charges, go ahead and send a letter.
Since I also provide a lump sum provisional credit, I will have a statement in my letter informing the cardholder that I have finalized $XX.XX of their provisional credit and am continuing to investigate the remaining $XX.XX. I will also again remind them of the deadline for the final resolution so that they know how much longer I have to complete the investigation.
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