Use the online email system on the
DVC site to contact MS: go to site, sign in, open "Help & Contact," and click on email us, and in member ID put in one of the meter ID's involved in the reservation. With a "few" weekend reservations, do one at a time (i.e., send separate emails for each weekend that has reservations from two membership numbers). In the explanation box, explain that you have two Member ID's, provide the number for each, and also the applicable reservation numbers and applicable resort and room categorie, and request that the reservations be linked.
Chat is also an option, but these days, like the phone system,it seems to be seldom working.