Wrong display at Pep

Went to Pep Tubatse Crossing, wanted to buy a U605 or U963 that were of Vodacom according to display, when I wanted to pay after their search for the handsets one was MTN locked the other Telkom locked. Why were they displayed under Vodacom, IT'S A MISTAKE THEY SAID. MXM, now I'm walking out without the handsent