Unhappy Telkom memeber

On the 24 August I went in store to cancel my contract because it was either due to be cancelled or upgrade the contract so we decide to cancel. Two months later get a letter of demand to pay Telkom a very high amount. Wanting to find out why I need to pay this amount a agent from the company phones me spends 30 min on the phone been rude, unhelpful and sarcastic to me telling me to go sort my payment out she cannot help me. I will not ever go to Telkom again the agents are just rude and unhelpful.