First, we joined as hosts under my name and contact details then changed to my wife's. In Host Settings it shows her phone number, but messages continue to be sent to mine.
Second, as guests the number it shows to call is incorrect in one digit. I can find no equivalent settings link for one's traveler details.
Both th issues seem basic but the web site is too uncluttered to a fault. I
You can go to your account setting > notification > and look for text messaging setting, you can chose which number to sent. You can also click 'change your phone numbers'. You can remove the wrong number and add the new one. Hope this help