Vodacom / Showmax rip-off

I "subscribed" to the 3 months FREE Showmax service offered via Vodacom. However, before the 3 month period expired, I cancelled this service. This can be corroborated by the fact that I was spammed from this point forward by Multichoice to re-subscribe.

However, when reviewing my latest Vodacom statement, I found that I was still being billed for this service 3 months on!

I raised a complaint with Vodacom who stated that they never received a cancellation instruction from Showmax while Showmax states that they did in fact supply this to Vodacom.

No one is hence taking ownership or providing me with an acceptable solution?!

This is about the principle - how do you justify charging someone for a service that was definitely suspended?