MISTAKE OF CHANGING FROM PREPAID TO CONTACT: CELLC

towards the end of May I received a call from cell c, I forgot the lady's name. I requested the data for my ipad sim to be limited to R99 the lady I spoke to confirmed and said she has set the limit to R99. I even told her that I will buy bundles if I reach my limit. to my horror by June I was told I owe +R2000. I called them and asked how did this happen as I requested a limit I was told there is no limit placed. immediately I removed the sim and I asked it to be stopped as I'm not happy. July I was charged R5000 and the R99 considering I requested it to be cancelled and the fact that the first call I requested that the LIMIT SHOULD BE R99. when I asked for the recording I was told they will investigate. the last person to was Rachel & the ref no:***. HOW CAN I ASK THAT THE LIMIT BE R99 AND THE NEXT THING I OWE R5000 BECAUSE SOMEONE DID NOT DO THIER JOB. I EVEN ASKED THE CONTRACT TO BE TEMINATED BUT I STILL GET CHARGED EVEN THOUGHT THE SIM IS SUSPENDED. HOW UNFAIR OF CELL I ASK FOR A LIMIT THEN THE NEXT I AM TOLD I OWE THOUSANDS AND THOUSANDS OF RANDS? CLEARLY THEY DONT CARE BOUT CLIENTS AS LONG AS THEY MILK THEM OF THIER HARD EARNED MONEY.