Horrible service

I went to the store to pay for my account. I specified to the cashier that I was going to pay R150 and he made an error and made it R1500. I realised when I was checking the receipt that they had deducted R1500 instead of R150. Immediately I reported back to the cashier that was helping me and he informed the manager. They did not acknowledge that they made a mistake instead they told me that I was behind my payment and could not do anything about it.