I complained too but I'd feel more indignant if the price was higher. I know some people would not complain straight away over a £2 code and would eventually forget about it thinking "it's only £2"
It’s the principle of the matter to be fair, my own code (at £2.99 worked fine) but I’d be complaining either way if the code was invalid irrespective of the price.
Maybe they have a load of codes from last time it was on offer and some system/human error means they don't know if a code has been sold already. At 2 quid people aren't going to complain quite as much as if they paid £20.
Same. It all seemed a bit dodgy - especially, being told the code had already been used. I emailed (one-liner, simply asking for new code) and got a reply within an hour with replacement code.
This is the email i sent and their reply