Swiggy — excess amount at the payment gateway

Address:

Nagpur, Maharashtra

I placed an order and it showed a different amt at the first page after applying promo code and the amt got changed at the payment gateway.
This is not happening for the first time and has happened previously as well.
I have been a regular customer but this is really pathetic from your end.
To top that the customer service is a big time fail at this.
My mobile no is [protected]