Data Ripoff - 5G Data depleted in one day

I have a serious complaint regarding my data usage this week from Vodacom. Please see below sequence of events together with supporting screenshots.

On Monday, 16 July 2019 - 13:11, I received an sms that i have less than 3353 MB left - 15:26, I received an sms that i have less than 1343 MB left - 15:33, I received an sms that i have less than 323MB left - 15:36, I received an sms that i have less than 128MB left - 15:38, I received an sms that my data has depleted.

On Wednesday, 17 July 2019 - 17:45, I purchased 2G data bundle. - 18:25, I received an sms that I have less than 1014 MB left - 18:58, I received an sms that i have less than 400 MB left

On Wednesday, 17 July 2019 - 21:05, I subsequently called Vodacom to query this and was told that applications that use my mobile data are causing this. I have had the same phone, with the same applications running for the past year, my cellphone behaviour was no different this week. So i do not want to hear any excuses about my phone's applications. This excuse is not good enough for me.

I requested further escalation last night to which i received a reference number: ***.

On Thursday, 18 July 2019 10:56, I receive an sms that my query has been closed and that my data usage is accurate. I am then told as a good gesture I have been credited with 1GB data bundle. What a joke!

This is not good enough! I would like my full data bundles to be refunded!