Hello @MattM CS,
I am having a similar issue. I recently submitted each of the special signing event Batman/Spawn #1 signed comics (3), and was charged for return shipping for all three books, rather than a single shipping cost. Also, I was billed for the Fedex shipping label - I did not use Fedex, but UPS. In total, I feel I was erroneously charged $45 for the Fedex shipping, additionally $40 for shipping on two of the submissions. I am hopeful that a similar resolution is possible.
Please let me know if I should provide additional context.
Respectfully,
Tom H