How do you defeat this type of return?

All my sales are merchant fulfillment. Buyers keep returning item claiming inaccurate website description forcing me to pay return shipping when the item sent and returned is an exact match to the listing. I open a safe-t-claim because the buyer used wrong return reason code since they really just changed their mind and they should have paid return shipping. Amazon asks me then to provide proof that the item returned was different than the item sent. This makes no sense. I feel like when a customer lies the only way I can win is by lying too, and saying they returned a different item, but my parents did me right (wrong?) So I can’t do that.