Footgear online customer service is a ****

I purchased tekkies for Christmas for my child from footgear on the 3rd of October through footgear online, they delivered a pair of left leg, I immediately contacted them and they told me that they have arranged with a courier company that never pitched for the whole month, Last week I went to their brunch in Eastgate mall,where I left the shoes they later contacted me saying that they will refund ,I told them I don't want a refund but exchange they refused claiming that they no longer have the same shoes which is untrue because when I went to Eastgate I saw a couple of the same shoe I bought Now since last week they promised to send me a voucher so I can go buy on the store ,today they have sent me a lot of emails claiming that they will send the voucher but they didn't I bought these shoes earlier to avoid disappointments now I am here desperate and trying to sort out the mess you guys created Now my child doesn't have shoes for Christmas thanks to you, how can you be do inconsiderate