How Can I Get The Call Log For My Prepaid Cell Phone?

I am assuming you have deleted your call log from your cell phone. TracFone, apparently, does not keep call logs for customers. I lost my phone (or it was stolen) and whoever had it used it to make some prank calls to my friends. I wanted to get a call log to learn more about these calls but TracFone's website says they are a prepaid service and do not produce call logs. I haven't been able to talk to a customer service rep at TracFone because the wait is too long and they haven't answered my e-mails.