Unknown debit order from my account

On the 2nd April a debit order went off from my account. The amount was R99.99. I called the Ned bank call centre to query. The amount was reversed and I was put through to the Tracing Department where I spoke to Ms Nokwethemba Khwula. The reference of the call was ***3. She was unable to provide much information as to how these people had gotten my personal details which allowed them to process the debit order. She didnt give me much solutions either but only to change my account and this was very unsatisfactory as this meant that even with a new account people still had access to my information. She gave me the name of a company called Fulcrum collection which then meant that I was to do my own investigation using my own resources. This is the companies number ***. This company is based in JHB. I called the company and they referred me to another company called Collect Serve which is based in DBN. the number for this company is 031 941 ***. I called the company and they could not provide details for the debit order. Instead they said they would call me back in 24hours then dropped the phone on me. I am very angry and inconvenienced. Who else has my details