I've been using the item for four years and nothing has happened.
Don't trivialise safety recalls. They don't usually mean that an item is immediately dangerous, but that in some circumstances it MAY present a danger. Many imported electrical devices don't comply with UK safety requirements; for electrical items this usually means a potential risk of electric shock or fire. Don't put yourself or other people at risk by ignorng it.
You certainly shouldn't rely on the word of a seller who obviously doesn't doesn't to know! If you search online you can probably find the reason for this recall. If the seller is a UK business seller and won't cooperate you should inform trading standards. (If they're in China, just bin it!)