Non-payment and complete disregard for client contact

We traveled to the USA in 2018 for an extended sabbatical and apart from our credit cards free travel insurance, we purchased additional travel insurance through Europ assistance(EA). I suffered a lower back injury about two weeks before the end of our stay and we really battled to get service from EA We eventually had to message family in SA and ask them to get EA to get in touch with us. It took 10hours. To make a long story short I ended up in a hospital in NY to have an operation, after being referred to the hospital by the local US agent for EA. The surgery went well and then, after EA wouldnt extend my families flights to match mine, 5 hours before departure, they finally changed our flights.

Then, 4 months later I receive emails from two of the hospitals saying that EA havent settle the bills after attempting to make contact with EA mutliple times. I have also sent emails to EA asking them to settle the bills but no one has has even responded to my emails(even though I have been sent read receipts).

I was well within my coverage period and only went to pre approved doctors and hospitals.

This is unacceptable and I need them to settle the bills immediately.