Poor service

I am so utterly disappointed at the service i have received from the bank. I have two issues that the bank cannot assist me with. Firstly on the 25th of April multichoice debited from my account and the transaction went through, a few days later I get a message from Multichoice saying my account has not been paid and therefore my service will be discontinued. When I check my list of debit orders on the app multichoice is still showing as a successful debit order. When i get to the branch to query this, I am told that the transaction did not go through because there were no funds in my account. My question is why is it still showing as a successful debit on my app and why did it I even get an SMS saying Multichoice has debited successfully if I supposedly did not have funds? Should'nt I have received an SMS saying my debit order was rejected?

Secondly around the same time, I get debited twice for the FNB funeral cover, I contact the call centre and was assisted by a rude lady by the name of Boitumelo (please retrieve the tape from this call). She asks if I have my bank statement open so i can read out to her the double debit transaction i ask her to hold so i can open it she tells me to "hurry up cause she does not have all day and has other clients to assist" Is this the quality you serve to your clients? My query might seem small to her but it is still an issue that needs solving regardless. She could not provide me with an answer as to why i was charged twice and no one else can even now.

Lastly i have random people who keep debiting from my account and i keep reversing these transactions and canceling them indefinitely yet they always manage to get our details and the bank tells me as long as they have my details there is nothing they can do for me. Is the bank not supposed to be protecting our accounts?

Can someone please assist me with the above?