You're not going to get cash for vouchers. They are in the right here.
Although I am never (willingly! I was forced to buy a laptop charger as my stupid massive public sector employer didn't have any to give me when my work one stopped functioning!) buying from Currys again. My dishwasher broke, and I needed a new one quickly, or I would not have gone there. I waited for well over an hour before I got the attention of a customer sales assistant. Picked one, paid for it, arranged delivery and installation. I made it clear that I was taking out a semi-integrated and replacing it with a freestanding.
So, delivery arrives. Guy comes in and glares at my hall table. "We're not going to be able to bring it in past that!" he hissed. Meantime he went into the kitchen, and announced they would not be installing the new machine, as I was changing from semi-integrated to freestanding and he didn't have time to do it (I had paid £55 for this service for convenience, plus £20 for delivery!) I pointed out that I had made the salesman aware of this. To no avail, of course.
Agreed they could bring it in through my patio doors at the back. So they did - and were about to leave it in the middle of my fucking dining room where I WFH!!! I called them back and said for £20 they could at least put it in the room it was meant to go in!!! They were just incredibly rude.
Stupidly I didn't check it over before they left, because there is a dent in the front of it and they wouldn't accept responsibility. Produced a photo taken from a dodgy angle that didn't show the dent. I was probably stupid but I gave up at that point.
You can't get through to the store when you call. I spoke to a customer disservice moron who hadn't a clue what he was talking about, and I had to go to the store to complain to the manager, and request the refund of the installation fee which I should have got automatically. Who was to call me back, and didn't bother his arse, so I had to go to the store again, where he showed me this photo that allegedly didn't show the dent.
Never again. I usually buy from independents where you can actually speak to a human being if you have a problem, but foo'ed up on this occasion.