Join Date: Nov 2005
Location: SIN / CNX / SFO
Programs: UA GS, SQ PPS, Hyatt Globalist, Marriott Titanium, Hilton Diamond, Accor Gold
Posts: 1,253
I've always sent documentation and a cover letter explaining what I want via mail to NH's LA office. Never had an issue and have always received proper credit in 2-4 weeks.
If you call, they'll notate your account, give you the address, and tell you what paperwork needs to be included.