Tour cancelled due to strike and need a refund

My friends and I booked a tour of the catacombs in paris for May 11th and after getting there today, apparently they’ve been on strike and closed since May 3rd? We were never notified and had no idea that the catacombs were on strike. I’ve e mailed the company that Viator booked through but haven’t heard anything yet (company called My Genie in Paris). Anyone have a similar experience in dealing with tours cancelled due to strikes and needing a refund? It was fairly expensive and we would like to get our money back. Thanks in advance!