Trade Me, Please stop showing Free Shipping, when Buyer selects combined shipping, it causes issues,

Trade Me, Please stop showing Free Shipping, when buyer selects combined shipping, it causes issues, 

I do not offer free shipping at all,  surely there must be a work around for this, when auctions do not offer free shipping?

because when they go and pay via Ping after they win by bidding they see free shipping, pay via Ping with no shipping thinking it is free and then I have to chase them up, and this is an example of the crap I get,

"Clearly there has been a slight accountacy error (on TradeMe or Ping’s part?),"

Yet they have clearly selected the combined shipping, Not a Trade Me error at all, Buyers error, 

I am over buyers doing this, so it shows free shipping, yet same page to right it shows what they have selected, NOT FREE !