Atrocious customer service

I purchased a coat from Superbalist on 18 May 2018. It was delivered on 22 May 2018. I opened the box and tried on the coat. The coat was too big so i decided to return it. I repackaged the coat in the packet and box and emailed my return request to Superbalist 25 May 2018. The coat was collected from me on 31 May 2018. One week later I received an email saying that the return would not be accepted as the item was not resellable. There are two small black dots on the coat which I did not notice when I received it. Superbalist refuse to accept the return or refund me. The customer service agents have been slow and lack any ability to resolve a problem. I am now expected to keep a damaged coat that is too big for me. I am shocked that the matter was handled like this and will never purchase from Superbalist again.