purchased an inferior product

I bought an All Star infants size 9..S&K Maponya Mall...on Monday the 15th of June 2015.my son only wore it. On the 21st sunday of june 2015..where it written all star @ the back the name fades.. When I went. Today 2 report I get the bad attitude...the manger told me that he I should never cum back and buy ..and that my R500 won't make him rich or poor. Kept on insulting me ..