Forget it, tell them you want a full refund assuming your in the UK and it’s a business seller you’re covered by the distance selling act where they HAVE TO give you a refund for *any reason* you just have to cover the return postage.
A partial refund means they will give you say £10 and you keep the defective items. If it’s a small defect you might be happy with this, personally I wouldn’t be.
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