Cancellation not actioned after numerous requests

I called Vodacom more than 2 months ago requesting a cancellation of my data contract. I was asked to call back a month later as thats when the cancellation was due, I did exactly that. I called back and cancelled my contract. The lady I spoke to assured me that this contract is cancelled. Since then I received a minimum of a call per day to upgrade my contract and I told every consultant that I cancelled this contract and I cannot understand why people are still calling me, the consultants will then check and note the cancellation and will apologise thereafter. I am trying to port this number to Telkom and only to find out that this contract is not cancelled !!! I called a week ago and spoke to customer care who said she will listen to the voice recording and get someone to call me back as I requested a refund. To date no one has called me. I called vodacom 4 times today - i was disconnected the first 3 times before speaking to a agent at the cancellations department. When eventually getting through and after explaining the entire situation over again, the guy hung up!!! is it because your cancellations department closes at 6pm??? The service I received is pathetic, I cannot understand how one treats a customer this way. I have two other contracts with vodacom and I will definitely be cancelled this as well due to the service you guys provide. Your call centre agents are unprofessional, they tend to have their private conversations and laughs an whilst they have you on hold. Can someone please contact me regarding this cancellation and refund ????