I got an insane deal on Blu-Rays

I was scrolling eBay around Christmas time looking to start collecting phase 2 of the MCU. I found an account who were selling Iron Man 3 for £1.99, but not only that, you could throw in another Blu-ray for completely free. So I threw in Captain America: The Winter Soldier

Fast forward a bit and it arrives. I rip open the package, tip it all out and find I got Iron Man 3 and Interstellar

I was very confused and messaged the seller asking what was going on and they basically said

“Oh sorry about that we’ll send you a copy of Captain America free of charge AND you get to keep Interstellar”

So now I have 3 movies for the price of 1