Need to change the size of mac

[Nisal]

I recently(2 months ago) purchased an apple macbook 15 in. for a credit agreement,but it seems too big for me, is there any possibility that I can change it to a 13 in.? 

[caesarome]

You can't change one model for another in an exchange as you want but you might be able to change it via the upgrade option the only issue you are going to have is that you will probably have a fair bit to pay of against if you do this.

[PandJ2020]

As above, you are past your cooling off period so the only (Sky) option would be an early swap but it could be prohibitively expensive as the trade in value won't cover the debt.

[TimmyBGood]

@Nisal 

Realistically only possible within the first month under consumer rights: the value of a very expensive bit of kit has now reduced significantly and no retailer would accept such a swap at their own cost.