We received a 'tax refund' this year. [=this year we paid too much income tax so we got some money back]
They refused to 'refund' the ticket. [=to give back the money that I had paid for the ticket]
If you are not completely satisfied, we will 'refund' the purchase price.
(..) BIFF: I bet he resold it. BIFF: I got to get something. MECHANIC: You want something? You can call Jones and if he wants to give you a refund... $! If I catch the guy that caused this I'll break his neck. The manure. I remember that. MECHANIC: cans of Valvoline. BIFF: cans for a $ job? (..)1989 Back to the Future Part II