Parcel delivered to the wrong address

So I placed two orders with Homechoice online and one of them just got delivered to the wrong address, which means the other one is on its way there too. On my online profile for their website both my billing and delivery address are the same and different to the one, they delivered to. They now expect me to pay out of my own pocket and return the parcel to them, I mean none of this is my fault and how do you let someone sign on my behalf without confirming with me via phone the same way I confirm my information to them as part of a security check they do? And where must I find the people who signed for the parcel? Really wanted to attach proof of this but the function does not exist here.