Hi Kaumeel
Thank you for your request.
You can only exchange or refund a Saver Day Pass in exceptional cases. A refund is only possible before the Saver Day Pass’s travel date. You must be able to prove that you have purchased a new ticket. So you have to buy new cards and then ask for a refund.
You will find detailed information on the conditions of sale here.
I wish you a nice weekend.
Best regards
NicolasK