Airtel — no service for airtel number in shillong

I have emailed twice and tried to call the customer service numbers many times, but i have not received even an acknowledgement of my emails, let alone a response for the calls. Despite having sufficient balance and despite my phone being in an area which has airtel coverage, my phone has no service for the past many days. My phone number is [protected]. I have not only lost number of days of validity of my recharges, but i have also had to figure out other means to have a mobile phone connection for the past many days. Kindly look into the problem immediately as i am facing a lot of problems.