What is happening to my airtime??????

<p>I have complained about this in the past and it has continued happening even after I have complained about it. I bought airtime less than an hour ago and made a single 2 minute call and when I try to make a second call I have no airtime. This happens all the ******* time!!!The last time I complained about this, I was told it was data, what data?man I have no applications running on my phone!!!for what could the data been used for?There were no notifications to do updates and I know for a fact that I have no open applications. I am due for an upgrade soon and at this rate, I doubt I will even continue service with you. It has even gotten to the point that I hate buying airtime with you because I know my airtime will get used up without me placing a single call!this is just plain ridiculous </p>