Save £80 offer on wrong laptop, how to change?

I'm about to buy an alienware laptop, I customized the one I wanted ready on the checkout and now I've just relieved an £80 off offer on it, I'm not sure where it came from, if it is a special dell were having or if it's automatically applied when i made an account.

The problem is that when i created this laptop, it was before they restocked on 512mb graphics cards so it is nearly £50 more expensive than it is now and it won't let me re build this system with both graphics card options so that it will reduce to the present price.

Is there anyway I can get this offer onto the newly customized laptop I've put on the checkout with same specs but nearly £50 less.

Thanks.

 

btw this offer is specifically underneath the more expensive M15x and not as a general basket discount or coupon so it wont apply if i add the new M15x into the basket and delete the old one.

 

anybody know?

 

try calling when ordering, you may even get a bettet deal.