Pick n Pay Plumstead Wrong Sell by Date

Hi Goodday,I bought a 2L pasteurized fresh *** milk on Saturday at the Plumstead branch,the sell by date is the 16th of September,today on the 11th of Sept the 2L milk is sour,and as thick as can be,I am so disappointed and the fact that it's one of their Brands.It is so wrong and unhealthy to sell products with wrong Sell by dates on.