Refund not paid for 3 weeks now

Hi All.. What ever you, please don't buy online stuff from these people. I bought a T shirt from them, it was a wrong size and I returned it for a refund and it's been 3 weeks now and they haven't paid me yet and I have been sending messages but no one is responding to me. When I call the online number ***), they hang off the phone without even answering it. This is the worst online experience I ever had in my life. Save yourself from this online shop if you don't want stress.