Airtel — deactivate the sim card and latter convert prepaid to postpaid without consent

Address:

59 feeder road, 700120

Sir, my mobile no [protected] deactivated by airtel on 6th nov 2019 for upgradation of sim card. Airtel ratail store ganesh chandra avenue at kolkata issued me a new sim card and told me it will start working after 6 hour but same was rejected due to father name recorded kumar kha inplace of niranjan kumar kha. This mistake done by airtel staff only because during porting from bsnl to airtel they entered wrong data. Aadhar card submitted which recorded correct information. Please do needful.
Latter airtel conver my pre paid connection to post paid which is more costlier than previous. Due to this conversion i lost one year unlimited talk time which was recharged just two months before. This process was done by airtel with out any consent from me to resolve this issue. They told me with out this conversion from prepaid to post paid, correction of father name is not possible. It is totally unethical business culture of airtel. Please rectify the same at the earliest to avoid monetary loss.