Unfair billing

<p><span style="color: #555555; background-color: #ffffff;">I've been struggling to come to terms with my out of data amount that I was charged & it's ridiculously high. It's very high to an extent that I feel it's unreasonable. Can someone please tell me why & what exactly caused it to be so high? I've had issues with this contract at the beginning of the year. 1 more year to go. I'll be patient but for now, someone please assist me in explaining to me so that I understand & have peace of mind.</span></p>