FNB feels they can just grab money out of your acc

FNB has debited me R2500 this weekend and when I alled in to get this reveresed, I was advised that this is from the loan dept and cannot be reversed! I have been on hold the entire day waiting for the loan dept to no avail! Then as I am om hold, I get an sms with another deduction of R585! You have drained my bank account leaving me with R300 left to survive for the entire month. How can you do that to your so called "valued clients"?! I will move to another bank if this is how you are going to treat me