FNB - #ITEM PAID NO FUNDS??

Seems there are NUMEROUS other people experiencing the same problem and I demand immediate clarification regarding numerous deductions on my account ranging from R765.00 to of R1 830.00 from my account, under the reference "#ITEM PAID NO FUNDS". This is despite me logging a call and being told that it will be dealt with. Then FNB proceeds to reverse the one deduction of R245.00 but fails to deal with the rest? This has placed my account in a negative balance and I am unable to make or receive any payments from my savings account! I have debit orders that have failed because of this!!

Upon reviewing my recent transactions, I noticed that these deductions were made despite the funds being available in my account at the time the purchases were made. I distinctly recall that the purchases were debited from my available balance without any issues and I have proof of this. I am perplexed as to why it now indicates that the funds were not available. I do NOT have an overdraft account linked to my cheque account and if I did not have the funds to make a purchase then it would have declined?? I request a refund for ALL the deducted amounts failing which I will have no other alternative but to approach further appropriate, and legal, forums.