Failed to cancel my Initial contract

I called cell C call centre multiple of times (Jan, Feb, March) with the objective of cancel my initial contract as it close to reach it 24 months and I was told an upgrade was done on my account that didn't sign up for and I was told I must go to the branch. I was not able to go to the branch as it was during level 5 of lockdown and I was stuck in Mpumalanga, I told them and they said they can't assist unfortunately. I sent multiple of e-mails to them to cancel the upgrade and initial contract, no response was received. I called again multiple of time telling them to cancel the initial contract and upgrade. They upgrade was eventually cancelled march, but the initial contract was not cancelled. On the countless e-mail I stipulated that I am cancelling the initial contract as I will be unemployed by end of June. However they kept the initial contract and now I keep getting calls telling me to pay a ridiculous amount for a contract I said must be cancelled before it goes over 24months. I am unemployed, I can barely afford to buy bread.