Poor service in the contract cancellation department

I have been trying to cancel my contract with cell C for the past three days and all they do is ask stupid questions and nothing is happening.

they keep on transferring me to another line which is not answered,

they have been pestering me for an upgrade, told them i dont want it , I want to cancel and some lady told me i am failing their security questions test, if i give my ID NUMBER AND ACCOUNT NUMBER THEY ARE DEBITING THAT SHOULD BE PROOF ENOUGH.

I dont want a new contract , i just want them to cancel and stop debiting my account