Originally Posted by 3Cforme

There are published rules for submission for missing points credit:

If a Member believes he or she did not receive the correct point credit(s) and/or miles for hotel stays, he or she must submit a written request for such credit(s) to the nearest Hilton Reservations and Customer Care office, together with a legible copy of the Member's hotel folio. Failure to supply the adequate and unaltered documentation may result in denial of such point credit or miles. For the Member's protection, all hotel travel documentation should be retained by the Member until the point credit has appeared on his or her HHonors statement. Requests must be received at Hilton Reservations and Customer Care within six months from the date of activity.

The presence of another guest with a similar name is irrelevant.