I still haven't got the refund....

ordered via AlphaHPC webpage
Order number: #1372;
Bitcoins paid: ฿18.41;
My address: 1NFv57gS4wzxTuxbQxwpQzEFZBWCQAsACN

transaction info:
https://blockchain.info/sl/tx/4c6c719ec964d758b055501ff7467d991c50040a3aa676717c92ca8a1c150edf

signature:
IEvGTUw5b/fYfmfBBsDgwJoIDlmBLxqieUWIEewSyx6W8/OwetD1HhVUtmwzdzj2htnXnk3L2D0Z18JKhQQnQt8=

Why is that?