I had a refund from them a year or two ago and although they gave me a refund (to my credit card) no problem, the communication was not existent and it took a couple of weeks for the refund to be processed. Very frustrating process talking to a brick wall but at last they refunded me.

I'd say a prezzy card will make no difference, it's still a Visa card so surely it's just as simple as a debit/credit refund.