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Hop in your Tardis and go back at least 3 years, 6 months.
A couple of issues, online for postpaid, you can access bills going back 12 months, for prepaid, 6 months. You also don't get a receipt as such as the bill effectively becomes the receipt once paid (although you do get a payment reference # and acknowledgement of payment on your next bill).
You could call 132200 and speak to billing to see if it's available, but I'm not sure if anything prior to 2 years ago is kept "live", so retrieval this far back may attract a fee.
Never be afraid to back yourself when trying new things, just always make sure you have 3 escape routes if things go wrong.