Exito Fashion House dresses are not what they advertise on Instagram

I bought a dress online at Exito Fashion House on 19 September and I received the packa11 day days later on the third of October which was the EFH PINK WRAP DRESS. To my surprise, the dress was nothing close to the one I saw on Instagram. It was sewn incorrectly. It was not aligned in the front and at the back of the dress. The material is totally different from the one I saw on Instagram. The button was loose, and it fell out of the dress while I was trying to button it up. Because I was very much unhappy with the dress I opted to return it and ask for a refund. I followed their rules for returns on Instagram by filling out a return form and putting my bank details so that I can be reimbursed. I then Courier back the dress within three days of receiving it. It did an overnight courier so that they could receive it the next day. I tried to call the cell phones that they have put up on Instagram for customer service, but none of them work. They always go to voicemail. I've also sent an email to them but I haven't received any acknowledgment Until to this day, I haven't been contacted or reimbursed my money. I've tried all that I can to reach them but I can't seem to get hold of them. I feel scanned and ill-treated. It cost me a lot to receive and courier back the dress. This company treated me badly. I will never buy from them. I've never gotten a bad service like this in South Africa