Thieving Staff

For the second time now I have returned home to find contents missing from my plastic bag the last person to have touched it was your staff. Today I went to checkers at Gateway among the items I purchased was a packet of fried chips for R19.99 the till lady started a conversation while the packer was packing and when I left they both said bye without a hint anything was wrong when I got home and my daughter wanted a snack there were NO CHIPS. This is now the Second time your staff does this and it is disgusting and its the same checkers. I want answers your people cant just ***** from customers