Hi dear, chronic cough is very common in Delhi right due to the severity of pollution. Do u wear your mask regularly?
Next Steps
When you were taking the above mentioned medicines, did u undergo any X-ray? If yes please post it's report here. U can continue the syrup for a while as it helps u
Health Tips
Increase your intake of warm drinking water. Take steam inhalation atleast 3 times a day. Could give u an alternate remedy for it. Please do consult here for further details.