Tikona — Generating bill even after disconnection request

I had a internet service plan of 3 month validity that going to be expired around 10 October. After two-three days later, I shifted to other location . I raised a request of connection shifting to that place, regarding of this query they told me that that area was not feasible for Tikona internet service, So I made a disconnection request of Tikona service, A engineer from Tikona came to my address and took all devices their devices excluding router(As Router was mine ).That engineer assured me that your connection will be disconnected within 48hr. After 2 weeks, But I still receive tikona bill messages onto my phone, I called customer care Helpline, they told me they ere automatically generated messages, you don't have to pay single penny as you made a disconnection request . After end of month, A bill remainder was generated for October month of INR 648, I called the dealer and he was asking me to pay this account and told me to send a email to TIKONA regarding disconnection, then I paid that bill and send an email for same . on the same day I called to customer helpline to told that I have paid all the bill, so don't generate new bills as I am not using your services, They assured me that no new bill will be generated from now, Again after sometime, I receive all the same message from TIKONA, again i called to customer care and told the same, they again told me the same . I sent mail on Date 13 November 2019, 20 November 2019, 11 December 2019 but nothing happens also I have all the recording (Around 10-12) in which they told me no bill will be generated . Today, I received a mail of Demand Notice to asking me to pay 1461 INR This is not right for the customers to charge bill for not using their service, A customer should only charge if they are using their Service . TIKONA Service ID - [protected] Billing Account Number[protected] I am attaching some email Snaps i sent to Tikona .please help me