Angry Client

hi , i have been using Telkom for years, contact basis, i was called by an agent and advised to upgrade my 99pm sim card to the 199pm sim on a month to month contract , was told numerous times i can cancel at any time - i have been trying to cancel my sim contract as i would like to change to fibre, i am now been told that i cannot its a contract and ill be liable to fees if i cancel , what ******* is that ? i need answers please Telkom - angry client