Poor Service from Makro PMB

I purchased a rayleigh 12" bicycle from Makro PMB for my son's birthday, he opened the bicycle on his birthday, rode it once on the cement and that evening when I went to pack it away I noticed that the training wheels were cracked, we then also discovered that the neck bearing bush on the frame was loose as well as the front wheel. When I took the bicycle back they refused to accept the bicycle because no.1 the bicycle was purchased more the 14 days ago and no.2 because they couldn't put the bicycle back on the shelf to re-sell but the bicycle had been sitting in the box for 3 weeks because my son couldn't in anyway and it should go back on the shelf due to the factory defults!