The customer named Julie took to Facebook on Tuesday after her usual shop to ask Woolworths why she had been charged GST on a 125g tin of 'Deep Cove Sardines in Oil'.

A Woolworths customer’s complaint over the amount of beef mince contained in what was supposed to be a 500g packet has drawn attention to a little-known code commonly found on supermarket products.

The customer shared a photograph of her Woolworths receipt which showed a hashtag symbol next to a can of Deep Cove Sardines in Oil. Know the news with the 7NEWS app: Download today The hashtag is ...