How do i contact hoc customer service? HOC Call Center Phone: (240) 627-9400 Email: [email protected] ; We continue to accept documents and paperwork via U.S. Mail. However, if you must drop off paperwork, drop boxes are located outside or just inside the front door of all HOC office and customer service center locations.Where is the hoc office located? HOC USA, Inc. 400 Riverwalk Parkway, Suite 200B Tonawanda, New York, USA 14150 Phone: 716.877.0475What is ad hoc? Ad Hoc. Ad Hoc brings small teams of skilled professionals together to build government digital services that are fast, efficient, and usable by everyone.What is a homeownership center hoc? Many of the mortgage insuring processes are centralized into four Homeownership Centers (HOC), each supporting a specific geographic area: Atlanta, Philadelphia, Denver and Santa Ana.