Billing after contract terminated.

I am FURIOUS! My boyfriend was able to upgrade December but decided he rather wants to cancel his contract. We did so and he was still billed. We were informed that he had to wait till 19 February which they moved to end of March. Since then we have been going in to Vodacom and phoning the 082 number they gave us numerous time, insuring us that the contract is cancelled. 4 Months later and Vodacom has been unable to terminate the contract and billing him without his consent!! According to the Consumer Protection Act he has and also had the right to terminate his contract with Vodacom once he reached 24months, which he did and is not supposed to automatically continue on a month-to-month basis(he then did terminate it numerous times). It has exceeded its 24 months. Utterly disgusted in the terrible service. He has been asking questions on social media but also led to a dead end.