No delivery/Impossible to get a reponse

Placed an order on 2 September 2018 and full payment was made by EFT. On following-up on my order a few days later, I was sent T&Cs that it would take between 7 to 30 working days. I was prepared to wait. However once the 30 working days were up, I tried contacting Benna Bok to no avail - they have not been responding to my emails or FB Messenger messages; there is never an answer on their landline. They are now outside their stipulated SLA - it is now more than 48 working days and have failed to deliver the goods they promised. I would now like a refund but it is impossible to contact them and get any response.