Data getting finished early

I have been experiencing problems with my airtime and data for the past months now. I buy 1g data and it's lasts me for 4 days and my airtime to but I hardly make phone calls... As it is I have done 2 active calls from the 1st but my airtime is finished. I called Vodacom in December to complain about this and they had told me that I was subscribed to something that actually finishes my data and airtime, they then unsubscribed me. My data is not always turned on and at times when I get home I use the WiFi at home. Still I don't understand why my data and airtime finishes off very quickly. This morning I called Vodacom customer care I spoke to Nandi who was sleeping and later on dropped the call on me without any assistance. I called again and spoke to Richard, I explained my query with him and he spoke to his supervisor by the name of Ndaba who is supposed to give me a call back but still hasn't called me. Richard advised that I'm actually subscribed once again to something that finishes my airtime which I know nothing about and he also dropped the line on me. I had to call Vodacom again and I went through to the PE branch I spoke to a team leader by the name of Kelly who didn't view my account, didn't ask to confirm the cell phone number in question but actually told me that because my phone is over a year old it automatically downloads things whether I'm offline or online. I asked her if she had reviewed this and if she was actually giving me feedback back to what she had seen from her side with regards to my phone. Vodacom I am truly and honestly tired if this now. I am old enough to know what to subscribe and what not not subscribe for. I don't have a kid or child that actually plays or does things with my phone. I want my airtime and data back with no excuses. This is my money