My hotel has been closed on booking

Hello, I hope everyone doing great. 

I search help with you because Booking closed my hotel.

I had 6 invoices to pay. I payed them all but there is no way to contact them :

On pulse they ask me to respond to their message with a proof in attached file, but I can not put in attached files nothing, I don’t have the option ! 

I call them, but there is only bot who gives advice 

I can’t find their email to send them proof. 

Please help me !!!! 

Thanks and best regards,