Airtel — airtel mumbai number

Address:	Mumbai City, Maharashtra, 400063
Website:	www.airtel.in

I have been an airtel postpaid customer for over 13 years. A couple of billing cycles ago, i was charged around rs1200 extra. When i contacted customer care n jan 13th - 2018, i was assured the matter will be resolved within 7 days. It did not get resolved, i called up again only to hear that the adjustment has been approved, but till date the issue has not been resolved even after repeated calls to customer care. Now the outgoing calls on my mobile has been barred.