FNB does not put their customers first

I have contacted FNB on numerous occasions telling them that i am receiving multiple peoples in-contact messages and still it has not been sorted. Is this not a concern for them that my email is being used for multiple transaction accounts?

As well as, is FNB attempting to make extra money off their clients by bouncing debit orders when the clients have sufficient funds in their account? then charging a no funds penalty when there is enough money? Why would you reverse a payment and place it as a no payment and still charge us for that when there is enough money . the money was taken off and then reversed and then stated as unpaid.