Can my pager company tell who sent the pages?

It depends on the route used to send them. A page submitted by phone might leave caller ID or call-detail records, while one sent through a website, email gateway, or another system may show a service account or network details instead. The pager message itself does not necessarily include the sender's number.

Even when some number appears in a record, it may be blocked, altered, or spoofed. So the provider may have records of the events without being able to confirm who was behind them.

Ask for the specific records behind the charge, not just whether they can identify a caller. Useful details would be timestamps, how each page entered the system, whether these were attempted or delivered messages, and what the monthly limit counts. They may be able to provide some of that without disclosing a private person's identity.

Since the charge was reversed, I would also ask them to confirm in writing what triggered the count and whether they can block the source or prevent another batch from running up a bill.

There are a few possibilities here, including traffic that came through a gateway, a billing or logging error, or pages that were counted but never reached the device. The provider's explanation might be accurate if its system only records totals or does not retain sender details, but that is not something you can assume either way from the pager technology alone.

Request an investigation of the unusually high count and ask whether the events came from one route or many. If it happens again, keep the bill and any service notices so you can compare dates and totals.