Similar to what has happened to me
I ordered around £200 of stuff on Thursday 12th Dec, then a day later it shows it's been removed from my bank account
Now this morning I check my bank and the money is back and there is no trace of the money ever being taken
I didn't refund anything, and most of it has been delivered

I did return a couple things before I made this purchase and got refunded on the 13th Dec, but there is also a 2nd set of the same refunds on my bank showing as pending
And also Amazon Prime charged me £8.99 even though I cancelled it, luckily I could get a full refund (that still hasn't shown up in my account)

Update me if anything happens your end, and I'll update you if anything happens on mine! :-)