Debt help signed me based on false information they provided

This people signed me under debt review based on false information.i received a call from them saying they see that am paying too much interest rate and south african rate has gone down so they wanna help me to reduce mine only later that day when I research about them I see who they are really..I tried to call on the numbers they called me with to tell them to cancel that application there was no answer tried to text them on WhatsApp they just blue tick me and come month end they deducted my 5900 I tried call them even now nobody answers me