Data issues

I’m really exhausted by Vodacom; I have had data issues for the past 3 days without any resolution. I have a contract with Vodacom which I bought data which didn’t even last for a week; then I bought 1GB more than once which depleted in less than a hour without opening any apps or surfing on the internet. I called Vodacom which I spoke to Rasheed who took me through my phone settings to switch off any background apps. Then I was reimbursed with 1GB which depleted within 15 minutes. I called Vodacom again to lodge a complaint in which I was given a reference number. The query came back resolved today that data is used correctly and I was reimbursed 500MB which depleted in less than 15 minutes with just being on WhatsApp (mind you I had purchased 1GB WhatsApp data). I just bought 1GB which depleted in 10 minutes without using it. I’m honestly drained by this. And I feel like their consultants do not have a solution and one (Sanele) had an attitude and told me it is my device. This device I’ve had for 2 years now and this is new to me.