Yeah, what you have is a weird mix - they keep changing stuff so often it's hard to keep track of! Sorry about that.
The description on our receipt was too similar between the two models so that has now been changed. If you want to return that one for an exchange or refund that's no problem, all the details are here: http://www.tartybikes.co.uk/pages/terms_and_conditions.html#returns. Obviously the reason the 2012 model now shows as out of stock is that you bought the last one, but since it's still here we could do a swap no problem.
PS: We have never and we would never change a customer's order without asking. The two bashrings look completely different anyway, the customer would always notice. One phone call takes a lot less time, effort and money than arranging an exchange, you would be stupid to even try it.