Crazy bank charges

I have been with FNB for almost 7 years and the charges I'm witnessing now I have never seen since I joined the bank. As I'm typing this my account is sitting on -R3000, how did we even get there FNB? during this economy in our country. I called them and I'm being told those are charges for the reserved purchases I made on the 31st of May. During the time I was making these purchases money on my account was subtracted in alignment with my purchases. So is FNB telling me I am now going to pay double for the purchases I made and their crazy reserved charges? this is day light ******* and I need my account fixed, I'm already being inconvenienced for the next month.