Is this regarding the item you bought on the 14th? Yes, there is something you can do. You can be a little bit more patient. The seller wants to get paid so they will send you an invoice. The seller has to determine the shipping for the combined items.
You're a seller of long standing. Treat your fellow sellers the same way you want your buyers to treat you.
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.