returns

bought a takkie for my son on Friday 27th March 2015 and advised one of the ladies that if its to small for my son i will return it for a bigger size,so i went on Monday the 30th to exchange it they refuse to exchange the shoe for a bigger size what am i to do now with a shoe that my son never had on he only fitted it on and walked a few minutes in the house to see if the shoe will hurt him and thats what he did,im so very dissappointed in Soviet as i always bye by them and never had a problem and which means that my money has gone to waste i just wanted a bigger size that is all.