Day light *******...again!!

A while back your systems made double deductions on your customers' accounts and you informed us that they'll be reversed. 2 amounts were made on my acc and they were reversed later the same day. However when you deducted you created a negative balance in my account. When the two payments were paid back it means that negative had to be paid and this was not my mistake. I wouldn't have a negative balance if it wasn't of your system errors. At the end of the day I was left with less than the amount I had before your mistake. Meaning you owe me! I've talking with a lot of your customer care agents and none of them is able to understand this simple mistake. Please have your manager or supervisor to contact me!!!