CVS Pharmacy Double billing thus cheating the customer and the insurance provider Malibu California

After sitting on 2 prescriptions for 3 days  the pharmacy said they were not authorized for payment by Workman's Compensation insurance but did very little to get the proper approvals. I appealed to both my doctor and attorney who informed me that they spoke with pharmacy staff and the approvals were authorized. Whe I came to pick up the medications I was told that they were not approved . After more than an hour of delay at the pharmacy counter I finally had to pay out of pocket for both prescriptions. The following day both my doctor and lawyer indicated they were paid for by Insurance and was billed to State of California;s Workman's Compensation insurance. Since I had already paid for the prescription with my credit card and they fraudulently double billed these medications I contacted CVS  consumer complaints who informed me that they could not (by policy) refund the credit card without me returning to the store and physically presenting my credit card and receipt to that particular store. The store made no attempt to inform me that they had double billed the prescription.  I was in no position to physically return to the store after knee replacement surgery.  Any other business routinely refunds credit card charges when it is deemed necessary. I wonder if this is a common practice at CVS that will surely increase their profits when the same product can be billed for twice. This whole process took many hours of phone calls to each party involved and is still not resolved.