Phantom Online sale

On the 22nd May 2020 Coricraft had an online sale and I bought cushions and other items. I waited without any updated until on the 2nd June I sent a request via their online platform enquiring. I then received a call in the evening telling me that the cushions that are ordered are out of stock and that I must now go to my nearest store to claim my refund. Firstly I used the online platform because I didn't want to go to the malls so why am I being told to go to the mall for a refund. If they didn't have stock why wait for so many days without letting me know?