Beware of very salty Jungle Oat Bran

We bought 4 boxes of Jungle oat bran from Woolworths. We started using the first box and found it extremely salty to the point of not being edible. We opened the second box and found the same thing. The 3rd box was fine, and that was when we noticed the batch for the salty boxes was the same and the remaining 2 were different. Something went badly wrong with that batch and now we are out of pocket as we don't have the slips for the purchase any more. Manufactured on the 15/05/2019 with a BB date of 15/05/2020 (07:55). Tried calling Tiger Brands careline, but they didn't bother calling back.