PnP Mango juice 100% juice or 100% expired?

My 5 Year old daughter started to complain of a cramping tummy, upon analyzing the food that she had consumed prior to the tummy cramps i realized that she had drank Half a bottle of Pnp brand 100% mango juice. i checked the date on the bottles that i had purchased YESTERDAY and to my surprise the SELLBY DATE on one of the bottles was the 26/07/2017 and USEBY DATE was the 02/08/2017, the SELLBY DATE on the second bottle 04/08/2017 and the USEBY DATE was 11/08/2017. it is almost two months since the SELLBY DATE has passed and this juice is still on the shelves at PnP at the Bolders Midrand! i am highly disgusted and will take matters furthur seeing that this could effect the health of my 5 year old.