SpidySpider
TF Premier
I don't think you have any liability to refund. Users should have spent the money by now. Very strange, how can they expect users to have the cashback present which was given in the past.
I believe you don't need to worry.
They are vaguely actually requesting you to pay back, not even mentioning amount due.
Let them send demand letter which they can not because you don't owe them any amount.
Also legal notice is not a general notice that they are sending to everyone. To be legally abidable it needs to be in the name of individual.
Quick question - Do they have your aadhar or PAN? and when did you receive the cashback amount?
DD se copy Kiya na?🤣🤣