Fnb Is A ****

FNB is a ****, fnb reserves money for purchases you make and than they make you account go on a negative an than tell you that the place where you swiped they did not bank the funds right away and the allowed your purchases to go through when you had no funds but no purchases ever go through when you have no funds. My question is if those purchases went through when i had no funds and where does the money that is reserved go to? Because i cant be charged double for one transaction. Fnb is a **** stay away and they dont do follow ups. I laid a complaim and they still havent answered me. Their consultants are ***********. Save yourself the headache