i got a bill of amount x but paytm says y why is it so can i still pay the bill on paytm

Utility Bill Payments
I got a bill of amount ‘X’ but paytm says ‘Y’. Why is it so. Can I still pay the bill on Paytm?

The amount may vary depending upon the discounts, late charges, previous month charges, etc. The amount we display is the exact amount sent to us by the service provider. We assure you that this amount is correct and would not result in any late charges etc.