Express Scripts review: Account not being written off when I was found not liable

I was prompted to set up a delivery for medication, and I informed Express Scripts, known to me as Accredo, that I needed to know how much it was going to cost before I consented to the shipment. I was told an estimate of $1,908 and that it could be adjusted once my insurance, Regence, was contacted, and the copay amount confirmed. We set up a tentative shipment date of March 8, 2023, reassured that I could cancel. The medication arrived at my doctor's office, The Portland Clinic, on February 28, 2023, unknown to me until they called to set up an appointment for injection. I refused as I was never told how much I would owe if I went forward with the injection. I attempted to call Regence myself for an estimate but they were not able to give me one without a Diagnosis Code, Procedure Code, Provider Name, an A J Code, and whether it was considered a therapeutic injection. No one was able to provide me with this information. Sometime after June 6, 2023, I received a bill from Express Scripts for $1,563.32. After countless communication between myself and Express Scripts, The Portland Clinic, and Regence, Express Scripts found me not at fault for the amount owed on July 31, 2023: saying that the employee I spoke with should not have said that the amount due could be adjusted after it was shipped, because once it is shipped, an invoice is created, the claim was sent to the insurance company, so the amount quoted to me would be my copay and I would be responsible, but failed to let me know, only continued to send me bills and ask for payment every time I called. As of September 8, 2023 I cannot get a turnaround time for when the amount will be charged off, and I keep receiving bills in the mail.