Here are some links to websites to practise listening about refunds and exchanges.
Returning Faulty Merchandise
http://www.moresettlement.org/LINC1-4/LINC3/banking.customer.service.phones/return.faulty.merch/index.htm
Refund and Exchange Policies
http://www.moresettlement.org/LINC1-4/LINC3/commercial.services.business/refunds.exchanges/index.htm
Returning an Item
http://esl.bowvalleycollege.ca/listen/mp3/return.html