It's actually NOC 0 - http://www5.hrsdc.gc.ca/NOC/English/NOC/2011/ProfileQuickSearch.aspx?val=0&val1=0621&val65=retail
Possible that's why you got the refusal.
1. Minimum 4 weeks of advertising the job before you your employer can apply for LMIA. 3-4 months to get LMIA, less than a month to...