You could take your parcel to the Post Office and pay over the counter to send it as a medium parcel.
Otherwise, you will need to cancel the transaction and relist the item with Evri as the postage option.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)
