Unauthorized debits

I reversed debit orders from procall and direct comm that were unauthorized but that money is not reflecting in my account. Firstly i dont know know who these people are and secondly i did not authorize these transactions. Secondly How did they get my bank details because i did not give it to them. Lastly are our details being given without our consent and why. I am really disappointed in all this because i tried getting answers from those people and was sent from pillar to post.. FNB you need to look after are personal details as per the POPI act i feel violated