Spar selling defective milk - AGAIN!

The 2l spar [ultra pateurised] milk is defective! This happened about 3 months back but came right after the supplier acknowledged a process fault and corrected it. The problem manifests itself by having little whitening effect and leavind a sludge in the cup after drinking tea or coffee. There appears to be no quality control and the supplier is sending a defective product to Spar! Don't phone me, phone the maker!