Rainbowlightsstudio.com.au Fraudulent, sent wrong item won't refund or replace. 15% refund.refuse to pay Internet

I ordered a pair of Hoka Hoka shoes Size 12. I received Salamon size 11. They said the warehouse sent the wrong ones and I should keep them and they would refund15%. They refuse to replace or send correct item as the shoes are useless to me. They don't fit and are incorrect shoe for the purpose. Emily told me it was all they could do as it was her profit margin. She refuses to accept responsibility.I have had several pieces correspondence and 15% is all they will do. $138 and they will only refund 15%. She said I hope you understand it is all as there is no profit!!! NO manager will contact.