A month ago, I received the same letter as @UncleB , notifying me of a CLD of approximately 25% on my Custom Cash card. I called the phone number in the letter and asked for the limit to be reinstated. The person on the phone said he would submit the request. Then, about 15 seconds later, he told me the request had been approved. I thought, "that was easy," but...
Weeks went by and my limit didn't go back up. Finally, today, almost a month after I called, I received an email telling me my limit has been restored. The subject line is "Your account has been reevaluated."
I don't understand why they could make the decision to reinstate in mere seconds, but then needed almost a month to implement it, but it doesn't really matter. Other than being slightly puzzled by the timeline, I can't really complain about how Citi handled this.
