Can't cancel Vodacom subscription from abroad

I am living abroad. I cancelled my Vodacom contracts before leaving South Africa but Vodacom is still debiting my South African Bank account for a 'ad-on'/'top-up' subscription that somehow was not cancelled with the contracts.

I have tried all means to have this resolved but the contact information on the web do not function. There are no other options to find support either. I have even tried an email address that I found somewhere on the web without success.

I would expect much better service and customer support...This is appalling and I see there are may others who have the exact same problem.