Data is just missing

I can't risk putting on my data or everything is missing. I closed all my background data in all my applications. Still my data runs out in seconds. I uploaded 100MB at 9:14 at 9:14 not even a few seconds later I received an SMS stating that my data on ********** 993 has run out. Is this just a **** so that we keep on buying data. I haven't even open an app yet and my data has run out. How is that possible.

Earlier I also purchesed 40 MB an within seconds that was also depleted. Is one message realy more than 100 MB.

1st. Your data is very expensive 2nd Your data doesn't even last for a few seconds, and we would have to reload constantly and it takes data to load data. Are you *****ing from your clients cause it feels like it. 3rd You bombard us with SMS's after airtime upload and before we can even use our phone data is depleted how does that work. 4th Call call centre at 111 you get rerouted. and even when you are willing to hold and wait due to the high volume of calls (what I bet is complaints) The call just get dropped so there is no one who can assist of fix this situation.

Your service is getting worse and worse and after years of being a valued costumer I am really considering my options.

I really don't believe that data gets depleted so easily when I am doing everything to save on data putting off background apps and everything.