You can reach Pearson VUE Monday through Friday from 7 a.m. to 7 p.m.
Central Time at 877-551-7587 (toll-free) or 952-905-7404.

You can find Pearson VUE's additional contact information
(including regional phone numbers, online chat, and email form) here:
 https://home.pearsonvue.com/comptia/contact.