All these type of microwaves has a shelf life of a few years these days. Especially ones with a 1 year warranty.
Just bear in mind this isn't an inverter microwave like the slightly more expensive Panasonics.
wonder if he ment this one ? https://www.hotukdeals.com/deals/samsung-23l-solo-microwave-white-5954-robert-dyas-3139113
Are you sure it was the 25L exact same model? A search on here & on google suggests otherwise