No response after complaint through website

I have been experiencing quality issues with Pick 'n Pay No Name brand UHT milk. The expiry date on the box states 26 Aug 2016, however when I open the box, the milk inside has already curdled. I happened once before, but last night, I opened 6 boxes in a row from 2 different six packs and they were all in different stages of curdling. I have taken pictures as photographic evidence. After last night's ordeal, I had to throw away 2 six packs of UHT milk.<br> I complained through Pick 'n Pay's website about a month ago and never received any response.<br> This is now 3 different six packs where I have experience issues with the quality of the No Name UHT milk.