cancellation of vodacom contract impossible with ******* company

I have made many calls since beginning of April to cancel a number on my vodacom account, at the 3rd call they said nothing was registered on the system it will be escalated and solved. so by the 11th call i was told the number were upgraded! the upgrade must 1st be cancelled to complete my cancellation request. I have agreed to no upgrade and did not sign anything!!!!