Whatever monthly amount you agree to on a contract, plan to pay more

Vodacom has the least consistent debit order system I've experienced. Even when I was buying devices, I specifically asked that all services be prepaid - l and that nothing be added as an extra to my debit order amount. I eventually managed to fix this issue, only to discover that the additional charges were coming from subscriptions like "Calling Line ID Presentation." Since when is that something we have to pay for? The monthly amount I thought I was signing up to pay? I’ve only actually paid that exact amount once. Whatever you think you're agreeing to pay each month, you'll end up paying more. My advice: avoid contracts at all cost.