False advertising on Adiclub,I redeemed points for a voucher on the 27th of september,when i wanted to use the voucher

False advertising on Adiclub,I redeemed points for a voucher on the 27th of september,when i wanted to use the voucher it was nolonger available on the apo,i emailed adidas customer care they requested for screen shots of the points i redeemed,i sent it and they promised they will get back to me within 1 -5 business days i must look out for the voucher on my emails or the adidas app,no respond so far,i called them and the not so professional manager told me that there is nothing they can do about the voucher and hanged up the phone on me