Cashier took my voucher for herself and swoped it with antother slip!!

I went to clicks with two vouchers I was given thinking they were clicks voucher however they were betting vouchers bought from clicks. I gave the cashier the two slips to redeem the voucher and she went and asked someone if she can redeem however they could not so she gave them back to me, this was on the 23rd December 2023, the vouchers were bought 21st December 2023. Checking the vouchers today because I had to take them back to the person who incorrectly bought them i noticed the one voucher is missing and when Sonwabo gave me the vouchers back it was two slips and she gave back one correct voucher an another slip might be from another customers purchase, slip of 500. When the slips were given to me they were folded together. I have good reasons to think that Sonwabo took the one voucher for herself and replaced it with the other R500 slip, she did not assist anyone else while I was waiting for her to check which could have been a mistake there is noway possible that the R500 slip could have jumped into her Hands and the voucher fell. I am waisting my holiday using my money to get to clearwater mall to have this issue sorted. This is so awful clicks I do not know how your staff is trained but you need to consider using other methods because asikwazi ukuphila nemigulukudu , this is called *****ing!!!