Swiggy — refund problem

I was told that i will get my refund within 24hours but it’s been three days everyday i have to chat and ask for refund and tell every detail everyday to their new executive after 3 days i got refund and that too was lesser than the amount that i should get.
I need that strict action should be taken regarding this.
I was told that i will get my refund on 25th and i got on 29th. I got ₹228 instead of ₹248
Everyday they tell the same thing that refund will be processed within 24hours but it took more than 72 hours.