PS4 purchased on interest free credit

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Hi,

Looking for some advice. I pre-ordered a PS4 console (on its own no bundled game or accessories) - this was offered with interest free credit at £349, and I was told I would get the item before Christmas.

As I placed the order at the beginning of September, so far I have made two payments on the loan. I was phoned by the store this week to be told that they were only being allocated Killzone bundle packs - and therefore I would have to pay another £40 for the game bundle - which is something I don't want.

I initially agreed thinking that I would just sell the game on - but then thought about it and told them no I just wanted the console as agreed and stated on my order.

What are my rights here - especially as the machines are in such short supply? Clearly they cannot offer me now what I originally ordered and have started paying for, within the agreed timescale...

Any ideas?

Thanks, Andy