Unfair pepertual bank charges by Capitec bank

Capitec bank has ******* like tendencies of allowing pepertual failed purchases on my Savings of R2 charge each within a very short time even if there are insufficient funds on my account. I don't have money that grows on trees and so I can't immediately deposit the money on my account prior to my pay day. As a result Capitec resort on allowing a string of failed purchases for only one type of failed purchases. As a result I end up owing Capitec a large amount of failed charges that accumulate for them, this is bizarre to say the least and, by the way, there are many other banks I can simply move my account to if they continue with these ************ activities, that's it !