Where did my data go??????

<p>On 20156/08/19 I checked and I had 19.65 Gb expiring on 15/09/2020. Now I have 0 Mb. I have Wifi at home and at work and is a very light data user when I am not on wifi - my point being that I am dead sure I did not use up this enormous amount of data.</p> <p>Additionally why was no communication given that I am out of data (which I was not, but still)??? Your out of bundle data tariffs are of such nature that I never use data unless I have a bundle.</p>