Very poor communication from We heart this

I bought jewelry from we heart this online store. The earrings did not fit so after several attempts to contact them they said they would be willing to refund me. I had the earrings sent to Cape Town for the refund. I have since emailed 4 x and tried to make contact online through Facebook messager and their online store. They responded to one of my first emails saying it had gone to their junk mail but I am now unable to contact them. This company has no phone number or other way of getting through to them. They indicate that they respond within 24 hours however I have been trying to make contact with this company for over a month with no avail and no refund. I think I company that is online and has no store or phone number needs much better communication methods for customers!! It is so frustrating constantly following up with no response or feedback!