Samsung is going to send out special boxes to collect the phones.
If you bought in the UK, you'll get a full refund and get to keep the Gear VR if you got one bundled.
If you bought from abroad, they'll collect it and refund based on what you paid abroad, looking at your receipt to see what it cost in pounds. You won't get refunded for postage and any duty you had to pay, as is obvious because that was down to you.
I fail to see what you're waiting to speak to Samsung about, other than to just delay returning it and hoping that sometime between now and then they issue another statement to say 'hey, don't worry, some of them are perfectly safe and those people can keep them'.
NOT GOING TO HAPPEN!
The other choice is to accept a Galaxy S7 edge and some money. I don't know how much, and it's up to you to decide if you'd rather take the money or a phone that for all intents and purposes is pretty much identical, bar the lack of HDR, a different curve to the display edges, and it being ever so slightly smaller. You lose, obviously, the S-Pen capabilities.
That it. These are your options. Advisors on the phone, for obvious reasons, will stick to their script religiously and not deviate in any way shape or form, to avoid future liability.
Anything you do from now on will be down to you. You are fully aware of the situation, and have admitted so here, so you could wind up being held accountable for any damage or harm that might come to you or others. You may find that your insurance company will notify you that it will not cover any damage that arises from the ownership of this phone.
Get rid of the damn thing! It's just a phone. A great phone that it's sad to see go, but it will be back in a newer, improved, safer form soon enough. Just get the S7 edge and use that for the time being.