Walker Wargame sent wrong items

I ordered an airsoft AK47 hopup chamber and a high torque motor (amongst other things) from Walker Wargame in Joburg. I stay in Durban and had to organise a courier. <br> <br> When I opened the package I discovered that Walker had sent me an M4 hopup unit and a High Speed motor. I emailed walker with pictures from his website of what I wanted and pictures of what he had sent me. He is willing to refund me for the items, but refuses to pay for the courier fee. The items cost me R520 but if I have to pay a courier fee to return them and a courier fee to get the correct items, then I have lost R300. It is now 2 weeks since I received the wrong order and Walker is no longer replying to my emails. I am very angry as I have spent a lot of money at his store in the past. He made the mistake, he should pay.<br> <br>