Debit order dispute

My name is Petunia Nkosi and I was approached by the company offering me a way to get my name cleared from the credit bureau. I gave them my banking details after listening to the lady who was "helping" me explain the whole situation. I agreed before I knew how much they were going to charge me for their service. Later on the day, I sent an email to her asking her to cancel the services because I don't think I'll be able to afford their services. She responded by saying she'll cancel. The date was the 5th of April. On the 21st of April my account was debited with the amount of R685, 00 by Finwell Legal Services. I immediately sent an email to the company asking them to return the money and the response was that they will get one of their consultants to contact me. On the 22nd I called the office and I spoke to a lady who said she'll escalate it and the "portfolio manager" will be in touch soon. Later in the day I called again. The call was picked up and dropped. I called three times and the same thing happened. Now I'm at my wit's end and I don't know what else to do. Why are they not giving me back my money after I cancelled the agreement. I cancelled the very same day, but 16 days later my account is debited 🤔.