Impossible to resolve a billing issue. Service was rendered on April 1st, 2016 and I'm still trying to get them to bill Medicare and United Health Care. I've called every month since I've been billed. Their mailbox is usually full and I've left messages through a receptionist at the service site. I've gone to their office in person once, yet I'm still billed! I've talked to a person at least twice. It is now February 2017 and I'm still being billed for something that is covered under Medicare!