I am having the same problem. I have called them at least 9 times over the past couple of weeks to reschedule an appointment that is supposed to take place next week. It is an appointment with a specialty clinic. Every time I call, I wait for 5-15 minutes to talk to an operator. When I finally get in touch with the operator, I ask to be transferred to the appropriate department. They transfer me, but once I'm transferred to the specialty clinic, there is an automated message and then the call gets ended automatically. Very annoying.
Call the clinic or online at myhealth.va.gov
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