I'm fed up with MTN and their airtime theft

I'm so furious with MTN. Their airtime theft is on another level, they automatically subscribe their customers on some ridiculous subscription service. My data only SIM is always on my router and when I checked I had a subscription that cost R39 per week and they already deducted R30 from my spend limit. Now I'm left with a debt of a subscription that I know nothing about.

I also have a prepaid card and they do the same, my friends and family are also complaining about the same problem. Before recharging with airtime you must first check for subscriptions that you didn't authorise, otherwise mtn will ***** your airtime.