The 15-day duplicate rule: how to catch callers Google charged you for twice

The rule, as Google states it

Google charges for a customer once in a 15-day window. After the October 1, 2026 billing change, Google’s Ads Liaison put it this way: an advertiser is charged once for follow-up calls within 15 days of the initial interaction, and any contact after 15 days “will generate a new lead and will be charged if it meets the valid lead criteria.”

October changed which contact gets charged. If the first call didn’t qualify (it was short, say), a later qualifying call between you and the same person can be charged. So the window starts at the first interaction, but the charge lands on the first contact that qualifies. Read more in our guide to the October 2026 billing change.

Where double charges slip through

Most repeat contacts are handled correctly. These are the cases worth checking:

Tracking numbers and extensions

Google sometimes shows a lead’s phone number as a Google tracking number instead of the caller’s own. When it does, it adds an extension, and the number-plus-extension pair is what identifies the caller. Two leads with the same tracking number but different extensions are different people. Matching on the number alone would wrongly flag them.

How to check by hand

1. Download your leads for the last 30 days (Local Services dashboard, or Google Ads → Goals → Conversions → Leads after your account moves).
2. Sort by phone number, then by date.
3. Find numbers (and extensions) that appear more than once within 15 days with more than one charged lead.
4. Keep the earliest charged lead. Rate each later charged one as a duplicate with “Rate this lead.”
5. Check back. Google says credits usually land within 30 days.

How CallWarden catches them automatically

Every time a lead arrives, CallWarden looks back 15 days on the same ads account for the same phone number, and the same extension when it’s a tracking number. The earliest charged, uncredited lead is treated as the original. Any later charged lead from that caller becomes a duplicate claim, with both leads shown side by side.

• It runs before any transcription, so it needs no recording and no Chrome extension.
• It’s part of the free 30-day audit, so you see your duplicates before you pay anything.
• In Co-Pilot mode, you approve each claim. Then CallWarden rates it with Google’s duplicate reason and tracks the credit.

CallWarden matches within each ads account. If you run several locations on separate accounts, a customer who calls two of them shows up once in each.

See what repeat callers might be costing you with the waste calculator, or check what changed with disputes after the move to Google Ads.