Telkom bad customer service

I had a contract for 24 months with Telkom and was on month 26 when I cancelled. I was billed early cancellation fee, which when I enquired they told me about an upgrade that was done on my line 13 months into the contract, that was never discussed with me. No only was I not aware of this,the statement continued to count the contract term as nothing changed, until I enquired about the cancellation fees. The agent that responded to my call was so arrogant and rude didn’t even want understand what I was saying but busy defending the incorrect cancellation fee app****.