Kotak Mahindra Bank — Charge reversal complaint

My name is Himanshu Dhingra and my crn no is[protected].I took a persoanl laon for 4.3 lac which was available with offer of 0 processing fee and 14% reducing interest and I also confirmed this from customer service twice before taking the loan.When the amount was disbursed I was charged for 4300+770 gst as processing fee from my card due to which my credit limit went in negative and i was also charged for overlimit fee for 500+90 gst. I called customer service and and they reversed the overlimit fee and raised a ticket for reversal on 2 october gave me a timeline for 7 working days also promised me to give call himself but nothing happened so I called them again 3 times and got same response.I escalated it to management where Mayuri told me that it will be done within 5 working days and she will give me a call but no luck.I called several time on the escalation number but everytime I was told that Mayuri is handling the case so she will call and they have arranged a call which I never received.I tried to go further to level 3 and 4 for eascalation the number is always busy the complaint is not getting submitted online getting an error " something went wrong" .please look into this and do something for this else will see for legal support.