Hi @eshim-66 ,
Thank you for your post.
If this was a simple delivery order the post office should be accepting all labels. If this is not the case you can let us know the post office details and we can share with our shipping team for feedback on ensuring they know the correct process for simple delivery packages.
If this was not a simple delivery order and you choose your own postage then you should have the option to cancel or void the label by going to postage labels and selecting from the drop down action menu. Then you can purchase the correct size label.
Thank you,
Kat