Typo Hyde Park Corner

I purchased a Metal Bottle Drinker and a Laptop Cover at Typo Hyde Park. The cashier Lucia, took R 598.00 in cash for both items but only scanned the bottle drinker. The invoice only accounts for R 299.00 and not the entire R 598.00. I had to submit the slip to my employer, so I went back to the store to correct this. The branch manager Nompumelelo, told me that their till cash amount balanced at close of business. Nompumelelo further said that I actually owe the store, which is insinuating theft. There is no way that I paid R 598.00 and the till collection is not over by R 299.00. When I asked to view the cameras, the branch Manager claimed that the store does not have cameras. How does a store not have cameras in 2019? I'm appalled to say the least. I will never shop at any Typo store if this is how they handle cash and treat their customers. Please resolve this.