Extremely poor service regarding a faulty product

I bought an (expensive) Egyptian cotton Queen duvet cover, the size was clearly marked on the bag it came in and the label on the cover itself says "Queen". As it turned out when I got it home, it is 10cm too short on one side, so it doesn't fit my duvet. I would have thought that this elementary fault could have been picked up by quality control.....but maybe such a thing doesn't exist here. I called the shop and was promised a call back with a solution within half an hour. That was this morning at around 09:45. It's now 4 hours later, I've called back twice & been put on hold trying to get through to someone who can assist - nothing. This is really poor customer service. I am 30 mins drive from the shop, so it's a real hassle when the product paid for is not what was advertised. I hope there is an @Home rep reading this who can get things moving, otherwise this business will not see my custom ever again.