Jersey Traders - Faulty product delivered

I had ordered a jersey with customised print at the back side. The print is faulty, thereby making the product unusable. The company 'Football Monk' has not provided a contact number for customer service, leaving Email as the only mode of communication for me, the customer. I have sent several emails to Football Monk outlining the issue in detail and attaching the necessary evidence (photos) of the fault in their product. But I haven't heard back from them. They have neither acknowledged the issue nor addressed it.