Cashier giving me attitude

I went there to Pep stores in Carletonville, was going to do money transfer. I had to transfer 1200.00 and the cashier made a mistake and punch in ,1000.00, and process the transaction. She just said to me should she put in the 200.00 and I said she should because I wanted to transfer 1200.00 not 1000.00. Mind you I'm paying the extra 10.00 for the transfer and was charged another 10.00 for 200.00 that was done after. I asked her why should I pay extra because it wasn't my mistake to put all the money and she answered me by saying, what am I expecting, what should she do because it needs to be paid. I said but it wasn't my mistake, and she continued to give me attitude with the loud voice. I'm really not happy with the service I received.