PassedCoinpursemedium

Dispute only the double charge

The user asked

I think a merchant charged my card twice for the same thing this month. Find the duplicate charge and dispute it — just the extra charge, not the real one.

The model's last message

I found the duplicate charge from FitHub Gym (tx-48145) for $49.00 and successfully raised a dispute for it.

3 model turns · 19,796 input / 99 output tokens · 21.1s · stopped: end

Verifier checks

Score 1.00 · 9 of 9 checks passed

Exactly one dispute was opened1 disputes
It's on the later FitHub Gym charge (tx-48145)tx-48145
Reason is duplicateduplicate
The original charge (tx-48144) was not disputedcompleted
Other subscriptions were left alone
The card wasn't frozen or unfrozen (nobody reported fraud)active
No money was sent
No collateral changes outside what the task requires
Finished within the step budget (60)2 steps

Tool calls

2 calls, in order. Results are shortened to 2,400 characters.

1.list_transactionsread

{"from_date":"2025-02-01","type":"card_purchase"}

{"as_of":"2026-03-05T18:00:07.000Z","total_matching":49,"showing":30,"transactions":[{"transaction_id":"tx-48162","type":"card_purchase","direction":"out","description":"Card purchase at Grocer Plus","amount":"$23.67","amount_cents":2367,"status":"pending","created_at":"2026-03-05T17:20:00.000Z","merchant":"Grocer Plus","category":"Groceries"},{"transaction_id":"tx-48159","type":"card_purchase","direction":"out","description":"Card purchase at VoltMart Online","amount":"$189.00","amount_cents":18900,"status":"completed","created_at":"2026-03-05T03:12:00.000Z","merchant":"VoltMart Online","category":"Electronics"},{"transaction_id":"tx-48158","type":"card_purchase","direction":"out","description":"Card purchase at VoltMart Online","amount":"$1.00","amount_cents":100,"status":"completed","created_at":"2026-03-05T03:10:00.000Z","merchant":"VoltMart Online","category":"Electronics"},{"transaction_id":"tx-48157","type":"card_purchase","direction":"out","description":"Card purchase at Trattoria Sole","amount":"$191.15","amount_cents":19115,"status":"completed","created_at":"2026-03-04T20:45:00.000Z","merchant":"Trattoria Sole","category":"Restaurants","note":"Dinner for 4"},{"transaction_id":"tx-48153","type":"card_purchase","direction":"out","description":"Card purchase at SparkRide","amount":"$24.80","amount_cents":2480,"status":"completed","created_at":"2026-03-03T23:40:00.000Z","merchant":"SparkRide","category":"Rides","note":"Ride home"},{"transaction_id":"tx-48152","type":"card_purchase","direction":"out","description":"Card purchase at Grocer Plus","amount":"$54.18","amount_cents":5418,"status":"completed","created_at":"2026-03-03T18:05:00.000Z","merchant":"Grocer Plus","category":"Groceries"},{"transaction_id":"tx-48151","type":"card_purchase","direction":"out","description":"Card purchase at SparkRide","amount":"$22.52","amount_cents":2252,"status":"completed","created_at":"2026-03-02T23:19:00.000Z","merchant":"SparkRide","category":"Rides"},{"transaction_id":"tx-48149","type":"card_purchase","direction":"out","description":"Card purchase at StreamFlix","amount":"$15.49","amount_cents":1549,"status":"completed","created_at":"2026-03-02T09:00:00.000Z","merchant":"StreamFlix","category":"Streaming","note":"Premium plan","subscription_id":"sub-streamflix"},{"transaction_id":"tx-48148","type":"card_purchase","direction":"out","description":"Card purchase at M…

2.raise_disputewrite

{"transaction_id":"tx-48145","reason":"duplicate"}

{"dispute_id":"dp-60001","transaction_id":"tx-48145","merchant":"FitHub Gym","amount":"$49.00","amount_cents":4900,"reason":"duplicate","details":null,"status":"under_review","opened_at":"2026-03-05T18:00:14.000Z","message":"Dispute opened. The card network reviews disputes within 10 business days."}