Woolworths Food Northgate manager threatens customers when complaining about his service

The Woolworths food at Northgate mall is the real ghetto and should close down.On Sunday around 12 i went to buy Salmon,couldn't find it,sold out maybe? Spent +- 20min looking for it and there was absolutely no one to assist on the floor,went to the till and got one of the ladies from the till points to assist me.The manager was very very rude,he told me he cant help me,i told him id lay a complaint on twitter he threatened "I will get you trust me" .When has shopping at Woolworths become life threatening??