Welcome to the club:

https://steemit.com/steemsilvergold/@welshstacker/my-mystery-coin-sender-strikes-again

It's been happening to me for years and I still don't know who it is. My guess is someone on steemit saw my post and thought they'd play funny buggers with you too.

I've never EVER paid the £2.50 and if they want the coin back they can come and get it. I didn't order it, I'm not paying for it. Ive never had any demand for payment off them since, so I just keep all the crap the y send me in a box.

I did ask if anyone knew if I were liable to pay the £2.50 since I didn't order it, but no one really knows.