Google is your friend.
Took me 20sec to find that, so clearly you'd be eligible to get full refund/replacement on item + return postage costs reimbursed. Plus I am almost certain from what they say about Nathan@MB he'd make sure you're compensated/correctly handled. Contact MB express your concerns and I'm sure they'll say to return it at gratis cost to you.
PS A sharp blade is a GOOD THING - so nothing to be afraid of at all. To say otherwise is like the non-cooks who say that they're afraid of using a knife because it's TOO sharp, it's the blunt blade & knife that will be far more likely to end up cutting you - not the very sharp ones.

Returning an item – postage and return costs
Returning small and medium-sized items
You are responsible for returning small and medium-sized items, such as a watch or microwave, to the store or seller. If you bought the item online, this means you must initially pay the return postage, shipping or courier costs.
Once the store or seller has the item, they will assess the problem. If the item has a major or minor fault, you are entitled to recover the return costs from the store or seller.
PS A sharp blade is a GOOD THING - so nothing to be afraid of at all. To say otherwise is like the non-cooks who say that they're afraid of using a knife because it's TOO sharp, it's the blunt blade & knife that will be far more likely to end up cutting you - not the very sharp ones.