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Todd Schultzyou should not need a subpoena to access your own account records. Hell, I can go online everyday and see who has called me and who I have called (Verizon), and of course the monthly statements would give that same info, and most cell phones themselves show the last 10 calls or so. If the call rolled into voice mail it should be easily retrieveable information; if not, (such as a hangup before voice mail or pick up) then it probably can't be found period.
Subpoeanas generally require that a legal action be commenced, with a case number, etc.--a ridiculous notion in your circumstances. There are no privacy concerns here that prevent a provider from giving you your own account information absent a court order (subpoena). My guess is you got some dipstick on the phone that either misunderstood your inquiry or doesn't know what day it is. I'd try again, and play the unhappy customer card who demands service card.