Carriage charges are unfair with free toggle sim

I purchased an international sim with a cariage charge of £0.99, OK fair enough.
 But you offer a free second sim, thank you very much, but charge £1.99 carriage, as it is now two items, although  you offer a sim free which I do not need and cannot delete from order.
I hope the sim works OK when I receive it and I put the free /£1.00 sIm in the draw to gather dust.
if you offer a free item it is totally unfair to charge extra delivery for the item which is as small as a credit card in its outer casing, and not actually required.