Items not in the bag

Good day. <br> It is sad to have to go this route, AGAIN.<br> Yesterday I went to Pick 'n Pay at Menlyn Mall and had no issues in the shop itself, <br> However,<br> I reached the payment point and all the cashiers were chatting while helping me, which I have no problem with,<br> My problem is with the fact that in the chatting process, the lady packing my bags did not pack and item that I paid almost R40 for, which to my regret I only saw when I got home, <br> I still have the receipt.<br> This is quite unacceptable as I stay in Montana / Rietfontein and to get in my car and drive all the way back for this is a waste of my time.<br> I just want what I paid for please??