What should I do if my DTV interview in Vientiane has been cancelled and I can't find a way to reschedule?

A user reported that their DTV interview scheduled for June 5th in Vientiane was cancelled without prior notice, and they found the eVisa portal reverted from "request for interview" to "pending approval." They seek advice on how to proceed given that there's no option to reschedule. Community members suggested checking for further communications, visiting the consulate directly to inquire about the reschedule, and carrying payment proof and original documents to facilitate inquiries.