Sneaker exchang

I bought a pair of sneakers online but when it came it was to big I saw in totalsport bellville they had the size I was looking for I drove all the way from athlone to bellville just to be told my wife was be with me to sign because I bought it on her account .Now my question is you can buy with someone else card online but you can't go just exchange something if it is not your account YOU not purchasing anything just exchanging but you can buy online without identification double standards and to top it all off the one sales guy was so arrogant poor service will never buy there again