A Facebook comment from an angry mother has gone viral after she was told she couldn’t exchange milk at Woolworths that she’d actually bought at Coles.

In the post, she wrote: “I got the wrong milk so went to woolies to swap it. The lady at the desk tell me I’m not allowed because it was the coles brand of the lite and I had to talk to coles about it [sic].”

“It’s just milk so I don’t see the problem!,” she continued. “My kids don’t like lite milk so now they have to go without until maybe Saturday when I can borrow some money to get some more from coles.”

“u did ur dash woolies and have lost me business [sic].”