Club Factory — wrong size products received

I received wrong sized products. I ordered total 5 items out of which 2 are of wrong sizes. One is a striped blouse which I ordered of size L but I received M and other a dungaree which I ordered of size XXL but I got size L. I even sent the photos of the received products and contacted the customer support but they are hopeless. They told me to return the products by courier but they won't pay me the shipping cost. On the return policy it is stated that if it is their fault then they will bear the shipping charges. As they sent the wrong sizes they should pay me the shipping cost. It's been two days but still they haven't properly replied yet. I'm only getting computerized messages. Very poor service and worst till now.