Get appropriate investigations done if nothing works. Before that, take a proper antibiotic course. Also,  it may be an allergic cough which takes some time to go away inspite of medicines. Drink warm water for some days.

I don't see any point changing your doctor or prscription so frequently. I can understand ypur anxiety but the prior combination that your physician advised, the one with azithro, pantoprazole, mucenac and montair LC is actually complete in itself. I would like you to complete this course of 5 days. 1. Add tab Pantoprazole to the current(2nd) regime. 2. Take steam inhalation atleast twice daily gor complete relief and quite benefit. 3. Drink atleast 8-10 glasses of water per day.

You have throat infection. You need proper treatment. Need details about your symptoms

Do test again . Any other symptoms like Fever or shortness of breath ? Any history of Diabetes ? Are you on any other medication apart from it ? Is only dry cough or cough with sputum production? Proper history required..

Test chest X-ray