Hi, I have just sold an item, a large item. I stated this on the listing and ticked Yodel, but should have ticked RM. However, on the listing I chose large parcel up to 20kg and got a quote for £5 something. I am now looking at getting the label and clicked on parcel size and weight, large between 10-20kg and the postage has shot up to £13 something!! Plus it has greyed out the Yodel option, even though the buyer chose it! Do I have to fork out the extra £8 something to cover the postage? Or can I request the buyer pays the extra cost?

Thanks