Employee robbing innocent people

My name is nosipo gumede ID number *** i have been a loyal customer paying may account regularly bt on the 31 august 2019 time 12:08:55 i went to one of your shop, store number 106 to pay my account and i was helped by one of your employees named zanele employee number *** i gave her R1500 we both counted the money and when i got home i took my slip and checked how far my account only to find out that she put in only R500 on my payment transaction number is ***. So on the following day i wnt back to the store only to be told that dey will wait for the bank to tell me if the money is extra or not since they dnt count the money the just hand it in to the cash in transit people and now im wondering how is that thing possible because from my knowledge the shop is supposed to count the money....is the cashier working with the manager because thats what the manager said and i must wait until when? Please i need assistance in all of these