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I’ve had similar experiences in South East Asia – although this was some time ago, especially the carrier absolving themselves bit. I think it’s the same in Russia as well, but in Russia you usually buy your handset separate of your phone plan. Surprising though that this is happening if you bought it through a bundle.
Personally I’d expect the ‘UK scenario’ as default. Carrier should handle returns process, just like if you bought it from Best Buy, Amazon, etc.