I booked a stay at Lake Powell Resorts in February...

I booked a stay at Lake Powell Resorts in February 2020 for August 2020. Due to Covid-19, my flight to the US has been cancelled (I am from France). I therefore tried to cancel my trip at Lake Powell Resorts and get a refund (more than 300$). However, I have been calling the hotel since the beginning of April, waiting hours over the phone, sending tons of emails and I have never been able to reach the hotel. No one is answering or calling me back, and I therefore don't know when/if I will ever get a refund. I now expect a response within a week or I will be forced to file a complaint with the competent authorities. R Childs