Poor returns process

I ordered a pair of Shokz OpenRun Bone Conduction Open-Ear Sport Headphones from Istore SA. The Price was good, and the product was delivered as expected. However, the product is really poor quality, and now trying to get it returned is proving to be very difficult. There is no response from the company, having already submitted my return application 4 days ago. If it was Takelot the product would have been collected and my account credited already.