Disciplinary Proceeding Against Me An Employee

I had bought few days of medicine with bill from first shop in one state but after that all my medical bills had to be made at second shop in a different state due to prescription date issues but purchase was still made from the first shop without bill. Prescription from both the shops were submitted but the batch number for the medicines was not changed by the second shop due to which I am under the lens of vigilance dept for 1. Medical irregularities - batch number issue 2. Fraudulent medical claim 3. Malpractice 4. Misuse of medical facilities, CDA rule Also second shop keeper gave in writing to vigilance department that he provided just the bill not the medicine. defence against this internal official inquiry in front of IA(inquiring authority) ? Shall I accept, deny or partially accept or plead guilty to all the above 4 charges as purchase was made, just there was billing issue.