Bad service - I want my money back

I have a contract with Vodacom, I haven't used my SIM card in while as I my phone is broken so I used a old phone ( Alcatel One touch )not a smart phone , when I tried to make a call my airtime was finished but I haven't used it for the month , when contacting Vodacom I was told that I has subscribed to a few apps but the phone I am using has no such function not even Whatsapp , So how can this happen this month , the consultant handling my call told me it will be escalated to their back office and he would get back to me its been almost 2 weeks Not sure how this happened, but this is not the first time Vodacom rips people off ,