Depends under which conditions you bought the pass monthes back. Was it a promotional pass? as these are usually like the current ones not refundable. 

It was a promotional pass but the interailing website states “promotional passes purchased from 1 march - 31st march are refundable and exchangeable”, and I bought it in march. So was just wondering if I returned it, if I could buy the same one again but with 50% off?

DO double check if there is ALSO a FINAL date on which this refund had to be claimed. It may very well be that this should also be done In March.

If not-well then to me its abundantly clear you can refund + wait a rather long time on the money actually to come back!!- and buy new one-today last day for discount.

Thanks for the advice. I have found out that I can exchange my current pass for the 50% off pass, but I don’t know how to exchange the pass.

Any help would be appreciated as the sale ends today.