They replied and said there is no way to combine bundles or prorate them or anything. What they did offer to do, which I'm very grateful for, was to refund the items I purchased so I can purchase bundles with no overlap instead (i.e. the $49.99 Player's Bundle + $76.99 Monster Bundle). I purchased the $79.99 DM Bundle + $29.99 Volo's Guide to Monsters + $29.99 Xanathar's Guide to Everything within the last 30 days, not sure if that factored in to them offering a refund or not. I told them to refund the DM Bundle and the separate books I purchased, I don't really need or want the Essentials Kits you get with the DM Bundle. At the end of the day I'll be spending $126.98 for Player's Handbook, Monster Manual, Xanathar's Guide to Everything, Volo's Guide to Monsters, and Mordenkainen's Tome of Foes which normally costs $149.99 individually, or $169.96 doing it the way I currently did it. They're giving me a savings of $42.98 which I'll probably just throw back into the game buying tokens or maybe another book. In the end they're still going to get the $169.96 but I'll be getting a bit more licensing for more IP. Everyone wins. Excellent customer service all around.