Fullerton India Credit — Not refunded extra EMI even after multiple complaints. All their claims and commitment are failing.

I have closed my loan more than 2 1/2 months back. They promised me at the time of closing that the EMI won't be deducted henceforth. But, it got deducted. On complaining they said that it will be refunded within 8 days. But its been more than 2 months now. I have visited their Andheri branch too multiple times. wrote so many emails, called them almost regularly. They only have one answer to everything that is - We are sorry for the inconvenience caused. Your case has been handed over to the higher authority team. We will look into the matter and update you on or before so and so date. But that's it. There is no response from them after that. I'm literally begging them everyday to return my excess EMI. this is causing me mental harassment now. I need my money with 26.5% interest for the time that they have used it for. Kindly take some action or I'll have to approach the court now. The last case id provided to me on email is Case ID:14514162.