Let me cancel my contract!

I've been trying to cancel my contract with Vodacom, unsuccessfully. I've requested THREE times on the cancellation number (***), once on the upgrades number and twice when consultants phoned to ask if I "wanted to upgrade my contract". I've received the SMSs to acknowledge that I want to cancel (three times) but this, somehow, does not translate to confirmation of cancellation.

I shouldn't have to jump through hoops to cancel a service that I no longer want or need. I don't want to incur more debt but Vodacom is making that near impossible! There is never a person to speak to for the cancellation, only an automated system. If I wait to talk to a person the call cuts off before I get through.