Airtel
Talk time promised but not provided

I have my tel connection from airtel 09860587701, i recd sms from the company to recharge the phone fro Rs.570 and promised a talk time of Rs501/- however though i have recharged within 24 hrs, i have been given talk time of Rs. 348 only, inspite of repeated contacts to consumer service no 123 i have been promised to give bale talk time within 48 hrs, but even after 12 days i have not recd, also now the call center says i will not get the talk time.

Is this not a clear case of cheating and duping of the customer...