Was sent the wrong product now they want me to pay to send it back

Hi Ian. Easy answer here. You don't. It is the sellers responsibility to pay for return postage for a faulty or mis-described item.

Not only is this a Trade Me policy, it is the law. No wriggling out of it.

Here is the relevant section of the Trade Me Buyer Protection Policy.

Kia Ora IAN,

TradeMe Ruling...

Return shipping

If your item needs return shipping

We expect:

• Not-as-described items to be returned to the seller.
• The seller to cover the cost of return shipping in these situations.
• The buyer and seller to work together in good faith, to get the item returned.
• Return shipping to be tracked. For items over $250, return shipping must be sent via 'signature required' courier.