I've got a long standing reservation for next month that had a minor schedule change a couple of weeks ago. I received an automated voicemail from US advising me to call about the change. I obliged and thought that was the end of it.

Couple of weeks later I get the same automated call advising of the same schedule change. As the date has gotten closer, these calls are becoming more frequent, almost daily. Today, I received not one but two calls within 4 hours.

Any ideas on how to make these phone calls stop?