FNB inconveniencing their clients

I have been having endless issues with this bank since December and I am officially closing this account. On Sunday I went to do some shopping, FNB released the money and transactions showed it went through, yesterday all the money is back in my bank account. When I called to ask what the situation is they said they had a system issue and now it is my responsibility to go to each of those stores with the receipts and ask them to check if they received the money and then ask them to reprocess the payment. FNB is now unable to assist and once again me as the client has to be inconvenienced due to their own faults. Same thing happened with debit orders that they allow to go off and then they put the money back into my account and charge ridiculous bank charges claiming there's no money in the account when there is more than enough. I'm tired of this bank! Banking with FNB is exhausting every month there's a new issue.