As you didn't actually ask them to send what you got, they can be considered unsolicited goods and the law states that you can keep them. It's part of The Consumer Contracts (Information, Cancellation and Additional Charges) Regulations 2013.
I disagree that the OP’s goods would fall under the category of unsolicited goods. The latter refer to items sent out of the blue to someone in the hope that the recipient’s forgetfulness will cause a contract to come into existence. With the advent of consumer legislation and awareness on the part of the general public, examples of unsolicited goods are few and far between.
In the OP’s case, goods were ordered from QVC, and the latter dispatched the wrong goods by mistake. The law treats unsolicited goods and goods sent out by mistake very differently.
In the OP’s case, the onus is on the recipient to inform QVC and ask the company to collect the goods within a reasonable time.
Last year, QVC sent me an expensive Elemis set, which I use, instead of an Elemis cleanser. I contacted QVC and the correct order was dispatched immediately; I returned the wrong item by return, and subsequently claimed for the postage.
Whether the OP chooses to keep the goods and hope that QVC will not contact the OP, is the latter’s call. When the same thing happened to me, for personal and professional reasons, I informed QVC immediately. My reasoning was that the goods were not mine to keep, and despite QVC’s less than sterling service over the years, I was not going to stoop to its level. With ‘clean hands’ I can continue - where need be - to criticise its service, goods, and presenters.