Bytes - totally shocking

I don't have a problem with Vodacom itself, but I do have a problem with Bytes. There are 25GB Bonus Data Bundles subscriptions on my account. From 2014 and 2015. I have been trying to cancel these. Today the Vodacom agent told me that I need to speak to Bytes as the orders came through them, and he rerouted my call. After a lot of ringing, my call was dropped. Not exactly the sort of service Vodacom wants to be associated with. How am I supposed to proceed?