Defamation case worth rupees one crore against sbi card [ credit card of sbi]

I hacd taken sbi delite credit card from sbi card in december 2019. its credit limit was rs 3 lakh including cash of rs 60000/-.i frequently go to jabalpur where my properties related cases are pending. on 7th march 2020 i went to jabalpur. due to lockdown from 25th march 2020 i could not come back from jabalpur to kolkata where my family is staying [ my wife and one daughter studying in mbbs ] from pg medical college of kolkata. in the month of march 2020 my credit limit was over. due to lockdown in the country my entire source of income closed. i was in aashram at jabalpur where use of mobile phone was limited. in line with rbis guidelines i applied for for moratorium for payment of credit card outstanding till 31st august 2020. i was in jabalpur upto 17th september 2020. in the meantime few staff of sbi card reached to my house at kolkata where my wife and daughter are residing. the stff of sbi created nusence in my house and shown indecent behaviour before my family. they also used slang language and thretended my family. after this incident i come back to jabalpur via delhi on 18th september 2020. this matter has been discussed with my wife daughter and my neighbours who are the witnesses . on next day [deleted] i made a call to one of the missed calls received by me on 18th and 19th september . it was the mobile number of junior executive of sbi card. when i asked him why your staff come to my house he also talked to me in hard words and indecent manner. he also abused me in slang language. i lodged a written complaint to police station on 5th october after my quarintine period over on 3rd october 2020. in this regard i want to make a civil suit of siander defamation under section 499 & 500 of ipc for value of rs. one crore against sbi card in calcutta high court . please advice me.