Do not trust Vodacom personnel

I have attempted to cancel my Vodacom wifi with Vodacom now since 7th of August. The first person stated that I had to phone back and cancel the contract on the 1st of October 2020. Which I did and spoke to George or Joss. Needless to say this contract is been deducted as regular as clockwork. On Saturday I went to Vodacom Shop Secunda and the person that assisted me was Shadrack. He helped me and guided me again to Vodacom cancellations. The first person I spoke to at cancellations was Lizel or Liezel, she promised to have the contract cancelled. Shadrack pointed to his screen and said that I should take a seat. The contract was not cancelled. The person at cancellations I spoke to next were Nonkululeto, after the whole explanation and why I wanted to cancel she transferred me to Customer care. The next person at cancellations was Maya or Mara. She immediately trasferred my call to Customer care. What must I do to cancel this contract??