Got ****** by nike.com

Good morning. I had to return a shoe I bought because it broke. Then I received a email saying my refund is being processed. I then called telling them I'm not using the same bank account anymore they must not process the funds in there I can provide them with my new account details. They refused to take my new account details and told me they have to refund it in there if it comes back to them they will contact me then I can give my new details. I've been calling for 20days spending over R600 in airtime .I've provided them with all the proof from my bank showing that I did not receive the money. They simply sent me a email saying there is nothing they can do and I'm not getting my money . I feel like I've been ****** by nike.com and I will never buy from them again. I'm so angry and disappointed. My shoe is gone and my money. Nike.com ****** me of R2300