Rain check not fullfilled

There was a special advertised on 12/07/2015 for white emborsed mugs, dinner plates & white doodle bowls. I went to Pick n pay in Lenasia and they did not have any stock on the day so they issued me with 4 rain checks (573690, 573688, 573691, 573689). It has now been almost three months and every time I phone the Lenasia branch they refer me to different people with different excuses namely Reggie, Lucky, Willie, Jaaqs and no responses or promises fulfilled. Please can you contact me on *** / ***.