Tiredvof data disappearing.

I complaime a few days ago revarding my data going so quickly when we always used to have a carry over. U got a reply saying they cjecked and found everything was right and they gave me some data back. Well the same thing has happened and as i said regarding their answer i was not satisfied with the answer as iy will just happen again and thats exactly what has happened. I am demanding a detailed explanation with regard to this. 3 of us have bouhht data for our ohones and have stopped using wifi as we too scared to use it. I am paying for this service but running off of phone data. I am wanting genuine explanations now and a detailed report showing what is using the data. This is not acceptable. Caren van der Merwe