Airtel — no signals (only) in airtelroaming network

i have been a prepaid customer o[censored]r airtel services for the last 6years.since last two days, i.e.19th and 20th june, i am facing loss of network coverage as soon as i enter roaming network.when, today i called up ur customer care executive, HE DENIED TO LODGE A COMPLAINT.THIS IS REALLY SORRY STATE FOR A COMPANY LIKE "AIRTEL".BUT THIS IS SHOCKING AS WELL.
THE EMPLOYEES OF AIRTEL INDIA IS BRINGING A REALLY BAD NAME FOR THE COMPANY, WHO PAYS THEM.
MY AIRTEL PREPAID NO. IS----[protected]