I work in an office of a factory. We get 8 litres of full fat milk a day delivered . I asked around to see if I changed 1 of the bottles to low fat milk if anyone one would mind. They all said ok so I was given permission by the accountant to change it. The cleaner seen the low fat milk in the fridge and freaked out . interrogating everyone to find out who changed. she demanded I change it back even though i don't answer to her. She is feer mongering anyone who drinks saying ' I can't believe your drinking' 'that's the last bottle of that you will see' . Hiding in the back of the fridge and refuses to put it inth same section as the other milk.. But the worst of it happened this morning when i realised she poured over half a litre of full fat milk into the carton of low fat milk. What the hell do i do in this situation because i know if i go to management they will laugh at its ridiculousness and wont take it seriously. I don't like confrontation so i dont know how to best approach.