CVS Minute Clinic Provided a diagnosis of illness Reston VA Virginia

We went to a minute clinic when my wife had what may have been strep throat.  We were told that our Blue Cross insurance would provide coverage so we completed the diagnostic and recieved a prescription.  Later our statement from Blue Cross indicated that the service was not covered.  A call to Blue Cross confirmed it.  Whe I called CVS to complain the CVS operator said he could quickly see that that CVS location was NOT covered by Blue Cross.  The physican cleary did not tell us that.  We would have gone elsewhere to check on her strep throat if they would have told us the truth.  The CVS operator said he could talk to the supervisor and they decided the best they could do was give us a 20% discount. This was clearly a CVS mistake but they charged us anyway.  I will never go to a CVS again and I will tell anybody else that they are untrustworhty.