Vodacom doesn't want to honour Showmax account link

Showmax had a promo last year where you could get 3 months free, and 9 months at a discounted price of R50 per month. During that promo period, I had been trying for several MONTHS to activate the service on my cell number, and after several "resolved" service requests and escalations between Showmax and Vodacom, I eventually gave up and still had no Showmax service.

I eventually hit the jackpot with my second number that is linked to my contract (a data sim) and got the Showmax service working with my Vodacom account. However after the 3 free months was up, my service was cancelled. When I call Vodacom, they say they can't help me because the number had insufficient airtime. The number is on a top-up contract and the Showmax amount was supposed to be deducted from my DEBIT ORDER / Vodacom BILL as it states on the website, not take the money from the airtime.

They also refuse to re-activate my subscription at the discounted price even though they were at fault to begin with, first by being unable to activate my primary number, and secondly for billing me incorrectly on my secondary number! So basically Vodacom and Showmax are saying "we don't want your business" ?! Tried activating again with my primary number, still it says "technical error"