I would not waste time asking the question online. I would ask the rental place
You have to return it early if you do not to be charged. I think 9 am. Tickets are non refundable, so no on a refund. Im not sure if they still give you a discount voucher for a different day if you turn you ticket in by noon. They used to do that.
After 9am they'll charge for full day rental. Lift tickets are not refundable.
They might give you a voucher or coupon for a half day ticket but that's only if you have bought a full day and checked out to Leave before 12:00
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