Cheating, Harrasment and Misbehavior

Location/place: Rohini, Delhi

Name of company/service: Bharti Airtel

I got my airtel broadband and landline connection in 2009 ‘on a SUNDAY. About 5-6 months back i started facing some troubles with my internet and also i realised that i was being overbilled. i called airtel customer care and requested them to send an executive on a Sunday as I am a working person and am available only on Sundays to which they replied that their executives do can’t come as they do not work on Sundays. Since I was not able to access my net properly, I stopped paying my bills because of which they discontinued my internet and started reminding me to pay. I refused to pay the whole 5 months’ amount as I wasn’t able to use the net because of some problems which were ignored by airtel so i was offered a settlement of INR 1600 which again the executive came to collect ‘on a SUNDAY’ and my service was recontinued. In a week, my connection was again discontinued and the customer care said that i had not been paying my bills. I still don’t have any idea where the SETTLEMENT amount of Rs. 1600 went. And when i talked to some executive Kritika that I want to discontinue my connection and i won’t pay any more, I got the reply that “aap hume mat kehna jab aapko THREATENING calls aayenge to”.

I want a few answers
1) Does airtel think us customers are fools, that when they need their money, Sundays are working but when customers need service, Sundays are off.
2) How dare a call center executive threaten me..? And if she does, then how is she penalised?