Money lost and no help from Checkers

I've went to Checkers Olympus yesterday 2019-11-17 at 15:00. I've needed to do a cash send to a family member, I withdrew R550 at the Nedbank ATM for the cash send, I was glad as the ATM gave me 5 R10 notes and could use a R10 for the admin fee and will then be able to send the full R500 to a family member. I also went to the ABSA bank to withdraw money from my savings account as my daughter requires fees for school and an umbrella as she's not having one. I've placed the money in my wallet and went to the store and helped my daughter to choose an umbrella and knew that the money market was next to the umbrellas and I did the cash send at counter 95, My daughter was standing next to me and I was in a hurry, I took out the money from my wallet and forgot about the extra R150 that I placed it with the R550 and not in the back sleeve, I left 4 R10 notes in my wallet and took only 1 R10 for the admin fee and took the remaining money in my wallet and gave it to the lady at the counter, she asked me how much I'm transfering and said R500. I asked her as well if I could pay a the money market and she said that I will have to pay at the tills. When I finished at the tills, I've went around to the tills and when I opened me wallet to take out the cash, I've realised that it's no longer there and should've given it to the lady. I was totally dumbstruck and paid with the wrong card and it was declining my card and then realised and paid with my correct card. I've completed the transaction and left the shop to go and think what had happened, I phoned the store when I got home and was told that they're going to do a cash up. The manager told me that there was no money extra in the till, but I knew that it could not be true, as the cashier could have waited a while or do another transaction first before taking the money and I knew for a fact that I gave her too much money. I've asked them to check the footage and they said that they could see my daughter next to me with a pink dress and did not find anything irregularities, I was angry as this is my money and why did the cashier not say that I paid her too much and be honest. I then phoned the store back and said that I would like to see the video footage or even if they could send it to me and was told that the manager left already and if I want to see it that I must come to the store before 16:00 in the afternoon and then the manager could also be asked if it could be given to me. I said to the person that I'm unable to be there before those times as I'm working till 17:00 and could only be there at about 18:00 and was not even able to try and arrange anything, the call dropped and I did not want to spend anymore more time and waste anymore money trying to resolve something that no-one will properly investigate. If it's necessary, the store can even check at the ATM's as I'm withdrawing the money until the moment I'm in the store and I would like to see the footage of the lady until she has been asked to cash up the till to audit for the money as it could've been taken out during another transaction, or when I left the store. I will gladly send you all the details on the slip upon request.