Well, "promptly" is defined as, with little or no delay; immediately.
If you opt to wait, your deadline remains and is unchanged. But for consumer protection if the bank would have been able to resolve the claim in 1 day, yet took 10, that would not be promptly and a violation of Reg E and likely considered a UDA(A)P issue as well causing consumer harm.
In reality when you interview the consumer and take notes and open a file, you have begun your investigation. The intent is, the consumer should not be disadvantaged because a bank always opts to wait until day 10 to start, or waits for a written claim. I think Valley Girl is on the right track.
My opinions are not necessarily my employers.
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell