WIN A CAR COMPETITION :Cheated of Entry

This Morning is not Good for me. I bought a pepper-steak and a can of coke all equating R29-90 the cashier on the receipt says Anikie (28 September 2018) She gave me the receipt after several minutes after i begged her for it because i want to enter a car competition,

she gave it to me and when i arrive at work ,i put the code *120*1071* ********** 870# it says please re-enter another code ,the code has already been used,it was only me and the cashier there is no way a system can produce a code that is already used,while this lady was widtholding my receipt she was busy holding her phone only to find she busy playing a competition using my receipt,you can even check cameras ,now i spend R29-90 for her to win a car,which means its what she does to unsuspecting consumers keeping their receipt for herself to play. please help me fight this "**********" entry my cell number ********** .I always buy there in the morning since they open early in the morning,but i feel betrayed by this lady after having to spend so much for nothing please help me cancel that entry in the competition it is iligal,we all want the car but unfortunately you must spend for that entry.I once won there two years ago and was assisted by a lady called Patricia.i always enter competitions there but im going to shift somewhere else.please help me trace that entry you will find the number belongs to that woman (cashier) im really heart broken i feel conned of R29-90.