Bad workmanship/product

I bought two pairs of Rumble shoes, a black and brown pair.<br> Both pairs within a week the valcro on the strap across the foot has come undone and is fraying.<br> I bought the shoes from Famous shoes, the owner swopped one pair and I have not had any problems at all. I still have the black pair that I cannot wear.<br> He says Bronx says they never have a problem and you won't do anything.<br> He also says I should have them fixed at a shoe maker. After spending R400 why do I have to have them fixed?<br> I'm sitting in the middle with a pair of useless shoes.<br> I guess I should stick to what I know which is Hi-Tec<br>