Amazon's refusal to communicate with customers.

I ordered and paid for a 2023 generation wifi extender and was sent an older version which is much cheaper. Amazon approved a refund but I must return it to the seller. I live off the grid and the item was couriered to me at no cost. For me to courier it to the seller will cost more than the price of the item. Amazon does not want to communicate with customers and I can find no means to get hold of them.