Welcome @Buckheadgirl - have you exchanged phone numbers ? Did you have a phone call or video chat before agreeing to sit ?
I am assuming from your post maybe not - you can contact member services who have alternative contact numbers for the home owner and they will reach out and try to contact them on your behalf.
To contact member services either use live chat and ask to speak to a human ( not the chat bot ) or e-mail:
Support@trustedhousesitters.com
if it’s urgent, write “URGENT “ in the title of your e-mail .
This seems to be happening all too frequently and was recently discussed on this thread
All the best and please let the forum know how you get on …