To preface: I was fortunate (now unfortunate ) enough to nab the voucher codes.

After a 15 minute wait, I managed to speak to an operator too expressing my concern over having my order cancelled too due to my card being declined (which I'm certain that isn't the case, my card has been active and working). He was extremely adamant, and very quick change his tone to a seemingly hostile one even though I was nothing but calm - basically saying that I had to re-order on the website, that my original order cannot be revived and that any/all discount vouchers are invalid.

I'm convinced that this'd been sneaky deceitful play on their part and I'm guessing it's been the same for others who used the codes too?