No response to request for itemized billing

I requested itemized billing for 1 of my account cell No *** from August 2013 to March 2014 the and was sent form to be completed witch I completed and faxed back on 2differted dates on the 19/6/2015 and 14 /07/2015<br> I have still not received any response This is becoming very urgent that I receive the itemized billing that I requested