Vodacom refusing ro cancel my contract

I really need intervention. I have been calling vodacom since last year september 2020 to cancel my contract which was due for an upgrade, they said it is cancelled but they continued debiting my account. In January 2021 i decided to reverse the debit order but they debited double end of February 2021. I then called again on the 26th of February at 12h09 requesting a cancellation, spoke to Vaneshrey, she assured me that contract has been camcelled only to find that she upgraded me to a Nokia C2. They had the phone to be delivered via RAM. When i called to ask what is going on, i was told that Vaneshry upgraded my account. I requested that they come take their phone cos i dont want a phone, no one has collected this phone. Im really frustrated and i will never recommend anyone to get a contract with Vodacom. PLEASE CANCEL MY CONTRACT YOH!!!!