The most useful thing you can send is a fee rate that is wrong. These calculators depend on figures that change several times a year, and they are only any good if they are current.
We cannot look into your eBay account, dispute a specific charge, or advise on tax. For an actual charge on a real sale, eBay's own Seller Hub is authoritative — these calculators are for planning prices before you list, not reconciling your statement afterwards.
This is a one-person project. Genuine rate errors are prioritised and usually corrected within a few days; everything else may take longer.