Still Paying for Services I don't Use

I have been trying to cancel three contracts, 2 of which started in 2013 and the other in 2014, with Vodacom for at least 5 years. Despite having informed them that I no longer make use of the devices, having had multiple calls regarding renewal where I requested cancellation (one of which was renewed by 'by mistake' and couldn't be reversed) and having been promised they would be cancelled, I am being billed for these contracts monthly. In desperation, I stopped the debit order last month, so they contact my daughter in the UK asking her to pay and stating the account is in arrears (by my calculation, Vodacom owes me R 56 685.72). I have just called again to cancel these, played the Vodacom musical chairs game and received a commitment that I will receive a call within the next 7 days. I can't wait (not holding my breath). #CEO