Not happy

I went to Usave in Duduza to buy some Usave long life full cream milk on the 17th Dec 2019. It had the best before use date of 17/08/2020; manufacturing date of 17/10/19 and a certain number maybe a batch number of ZF6/*** on it and I opened the milk on the 21st Dec only to find it was more of a sour milk than fresh milk, but then I had thrown away my till slip. I then had to pour the milk down the drain. Please do a thorough check when doing the packing because this can't be tolerated. The brand on the was a USAVE brand