Indusind Bank — charges on credit card even after credit card closure

I moved to us and then i closed by credit card by calling and asked for final amount which i did not heard back. After few months i again called and by then even though my card was cancelled in 2017 they kept on adding charges. Sent several emails with all the incidents happened date wise but everytime so lame response or sometime no response at all.
Again i called after a year and then did a final settlement which they asked and they said they will wave off the rest of the charges if i make this payment. I did the payment but they never waived off and kept on increasing my balance.

After two years when i visited india i went to branch but they asked me to call customer care again which ended up in same story.

Now they gave me a number of someone and asked me to call him, when i called that person he asked me to send email which i had sent. I sent them and now he is not picking the call. I am tired of reaching to them and even after making final payment they are sending monthly statement.