Complaint about dishonesty

on friday the 1st of september i went to pick a pay northcliff, at the till point the lady scaned my items when it was time to pay she ask me if i have a smart shoppers card,next to me was a guy speaking in their language,i then saw how she took his smart shoppers card and put my amount that i spend at pick a pay on his card i then ask her what are you doing the guy went to a nother till where he spend the points that was given to him.i am verry unhappy about this situation,the lady that was responsible.her name is maropeng maenejia,and works at pick a pay northcliff .wonder how many people has she already helped on this way,to me this is very unfair.if my problem will not be taken seriousley i will most defnitly taken this matter further.my cell nb is ********** 361.kind regards marie????????