Business ProfileforSound Oxygen Service LLC

My insurance changed 7/31/2023 and I updated it that day with Sound Oxygen. My CPAP resupply with Sound Oxygen went through fine in August 2023 and was billed to my insurance, Regence Blueshield without any issues. Since then I had a re-supply on 11/26/2023 that has not been properly submitted to Regence and I keep getting invoices with automatic payment deadlines only about a week away. Each time I call the billing department at Sound Oxygen, confirm that they have the correct insurance information for me, which they do, and they tell me they will re-submit the claims to Regence. I call Regence and they tell me they have nothing pending from Sound Oxygen and the claims must be being submitted incorrected.I've spent hours on hold calling the billing **** at Sound Oxygen multiple times and getting nowhere. Many times I reach someone who tells me incorrectly that they're billing me because my insurance only covers 70%, but that isnt true and the Explanation of Benefits for the successful resupply in August shows that.I'm getting super frustrated at spending time on the phone every week trying to get this resolved and no one at Sound Oxygen seems to be able to identify or correct the issue with claims processing.I've attached the *** from the successful claim in August and a couple example invoices of the kind I'm receiving every week or two for items that should be sent to insurance and fully covered but for some reason are not.