Gujarat Technological University — Amount deducted

Hello, Sir. I have one question and I don't know who to contact for this query so I decide to message you.

So, currently my friend whose in chemical department 4th Semester actually got his result of 3rd semester and he applied for reassement and recheck and I have paid the fees required for it and the amount got taken away from my bank balance but it's not showing in his gtu portal profile. The money is deduced but it still not showing in history and asking to pay again.

What should we do? Who do we have to contact here?