To report fraudulent activity or dispute a transaction, log into your M1 account and head to the Spend > Transactions tab.
Once you’re there, you will see a list of your transactions. Select the transaction you’d like to dispute. If you have more than one transaction, you will have to select each individually. At the bottom, click the button that says “Report issue with your transaction”.
Make sure to lock your card. Note that locking your card does not cancel your debit card. It simply stops future transactions from happening. You can unlock your card at any time in the app.
Once you’ve locked your card, click contact support and include why you are disputing this transaction.