Microsoft — Office 365 subscription without notice and pre confirmation

I have subscribed to trial version of office 365 when I have tried to cancel your website shows no active subscription exists but on 21st March my account got debited with subscription amount of 6252 due to lockdown I was not able to contact neither bank nor movrosoft but when I contacted the customer care the executive told me to contact bank for refund bank also denied that the amout has been transferred to Microsoft . Now I need refund for it as I was not even using office 365 since then why should I pay if I was not interested I am going to file consumer case against the company