Frustrated with Vodacom

I'm not sure when the settings change on my number but when my data is finished it never used to take airtime and I had to convert airtime to data now when my data is finished no proper communication to say data is depleted, once that happens it takes my airtime then also uses airtime advance without me having to opt in, how is that fair Vodacom? Then I recharge then it services airtime advance which I never opt in for. Would love to hear what happened on my phone and still for years no numbers show on my phone but we must pay for that. On the verge of switching networks! Would love to get feedback on what happened here???