Prisma Health complaint: Sent collections after us again.

This is the second time they’ve sent collections agency after us for their mistake. We’ve have several problems with their billing department over the years. But most recently a bill for a visit for my wife on 17 June 2019 that they did not file a claim with our insurance company for. Because it has been over one year now CHAMPVA insurance will not cover it. So because they failed to do their jobs they want to stick us for their mistake. I’ve left multiple voice messages for Lauri Pendleton and Sherry Wilson in billing and they refuse to return my call after weeks. They have 2 out of 5 starts on Google reviews and 1 out of 5 stars on Facebook reviews. It’s obvious why. They call themselves healthcare providers but they should even be allowed around people with grotesque incompetence like this. I would post a letter from them stating they are filing with CHAMPVA proving they had the insurance info all along but the site doesn’t allow .pdf files.