If the case is still in its warranty period I would contact Samsonite. I had a similar thing happen and they sent out a full set of replacement swivel castors I replaced myself. They didn't ask for any proof of purchase - just asked for an address to post them out to.
The Frequent Flyer Concierge team takes the hard work out of finding reward seat availability. Using their expert knowledge and specialised tools, they'll help you book a great trip that maximises the value for your points.
That's the irony, the warranty say it's covered, but not for actual travel! Just remembering that 'The Checkout' on ABC exposed this too I think:
This warranty covers only manufacturing defects and does not cover any damage caused by misuse (such as transportation of unusual items), neglect, accidents, abrasion, exposure to extreme temperatures, solvents, acids, water, normal wear and tear or transport damage (by airlines for example).
To give you an idea, when I took it to Sydney Luggage Repair (who do the warranty and airline damage claims) they quoted me $90 for wheel replacement. I choose to simply buy a new bag.
From just $6 we'll remove all advertisements so that you can enjoy a cleaner and uninterupted viewing experience.And you'll be supporting us so that we can continue to provide this valuable resource :)