I still haven't received my money from Spree and this is beginning to turn into a ****!

I ordered a pay of FILA-F13 Sneakers from Spree online and I paid the money via EFT and got a response saying my order will be delivered on Wednesday ( 13 December 2017). After 2 days has passed, I received an email saying the following:

"Hi Garth,

We know how much you were looking forward to receiving your order # ********** 90, but unfortunately we will not be able to deliver your item(s) to you. We are sorry about the inconvenience.

We've already reimbursed you with store credit. If you'd prefer a refund, please let us know by replying to this email and we will gladly assist you.

We understand and share your frustration. Rest assured that we will do absolutely everything we can to provide you with a much better experience the next time you shop with us."

Do you see any explanation as to why they cancelled my order? This was a christmas gift for my younger brother and now not only have I not received my order, but now they haven't given my money back. Surely I could have gotten something else for my brother with the R1 499 I paid for the order. This is sickening because I am not being assisted by Spree employees nor is my complaint being attended to. Spree has gone silent. And what scares me is that a vast amount of customers are complaining on Spree's Facebook page and what is Spree's solution? The customer who complains gets blocked. I am a journalist and I feel like taking this to the media and getting all those customers to share their story. I can assure you Spree will lose Thousands. But I do not want to resort to this as I just want my money back so that I can get my brother sneakers somewhere else.

Please Help Me.