Wherever you are Airtel Network WILL let you down

This morning I received a call:
'Good morning sir, I am calling from Airtel. Would you be interested in moving to the 250 plan from the 150?'
I said, 'No, I moved to 150 from 250.'
'What did you say sir? You are breaking up. Your signal is weak,' He said.
'My point. And you want me to graduate to a higher rental plan?' And I hung up.
My Airtel (Bangalore) is not reachable. It's been that way for about a week now. Can one of you tell me if you are facing the same problem? None of my friends are able to reach me ("Why don't you feed your F&*^%$@ phone or the S$%^&*() up SIM Card into the sea?" said Nanda).
I am facing these problems:
1) I am not able connect a call to another mobile.
2) When I receive a call, it disconnects after 20 seconds.

If there is a problem Airtel is not talking about it. But their website proclaims 'Wherever you are one network never lets you down'. There's a catch there. They did not mention which network.
Update: In Bangalore call 98450-98450 OR 98450-12345 and report the problem. I mean, if you are lucky to get through to the customer-care officer that is. Can you believe it, their website does not have contact phone numbers. The only way to contact them on their website is through a stupid form. I have been on hold for 10 minutes now. No sign of the customer-care officer yet.

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