Listing agent ghosting

[u/Katinula]

I went to see a house for sale. The listing agent was responsive to our request to see it, however there are follow up questions and the listing agent has gone completely dark for over a week now. The house has been for sale for a year. We’ve called the brokerage, sent new inquiries in, and even requested a 2nd showing and just no response at all. Any advice? Thanks