Family Dollar complaint: Bad drink

I purchased a armour body drink on June 4, 2024, and I opened the juice as soon as I set in my car and the drink was sour or old so I am still at the store and walked back in to let the cashier know it is bad and sour that it needs to be taken off the shelf and reported. She told me there was nothing she could do as far as giving me a refund or checking other products because I had opened the item.

This is very unprofessional and if I get sick I will be sueing because of her unprofessional behavior. She could have called a manager or something and asked what should be done instead she told me that since I opened it there was nothing she could do I have my receipt and I will never return to the Family Dollar store in Whiteville, Tn again.

Thanks for nothing I will be contacting a lawyer for this matter, because of that employee and I could get sick behind this.