Airtel — harassment facing at airtel office, of city centre 1 salt lake kolkata

This is to mention that my mother mrs mira ghosh was having the airtei mobile prepaid connection with number [protected]. Due to her demise i went to airtel office of city centre1, salt lake, kolkata two months back to transfer the number in my name (Rimi biswas). I was informed from the office that for name transfer the plan has to be changed to post paid plan and i need to carry on the plan minimum for 5 months for getting converted to prepaid again. Though initially i was not convinced but ultimately under their influence agreed to shift to the post paid plan as suggested by a counter sales man for which i need to pay rs349/month and getting the facility o[censored]nlimited call.
Now i have received sms few days back that i have been charged rs791.71 for last two months which does not match the according to the above mentioned plan explained to me. Out going call facility was stopped. Yesterday (23.5.18) i again went to the above mentioned airtel office for converting it to prepaid plan. Then they told me that i need to pay rs797 as outstanding to get converted to prepaid plan. I paid the amount immediately. Then surprisingly i received another sms immediately for paying rs 200 more which they told from above mentioned office as rental fee from 3.5.18 to 23.5.18. They again advised me to pay that rs.200 on spot for converting to prepaid plan. I did the payment immediately as advised by them but surprisingly they refused to give any bill or receipt or details against the above two payments i made. Then i received the sms that my request for converting the plan to prepaid has been accepted and from city centre 1 office they confirmed that it will be done within 4 working days. Adding to my surprise after coming back to home i got sms from customer care acknowledging the receiving of payments of two above mentioned amounts and also advised me to pay rs220.29p more as due to continue with the procedure. Under this circumstances i would request you to disconnect my line with immediate effect (24.5.2018) since i dont want to continue with airtel services any more. Moreover until and unless i get bill details with proper receipt for the above mentioned payments i made and proper bill details for the amount due i am unable to pay any amount further.
Kindly discontinue my line with immediate effect (24.5.2018).
Yesterday my case was handled by ms suparna pal.
Looking forward for your valuable cooperation.