We have a client who has been making online purchases from our Square store for a few months. We have confirmed the billing name/location, shipping name/location, and have had email communication about the orders as one had to be canceled and changed. We have about $20k/month from online sales and $30/40k from in store and invoiced orders, their chargebacks account for 2/3s of my total chargebacks EVER over the last 6 years with square. they have done 8 total in the last week.

They charged back 2 of the orders last week, then charged back 3 more a couple days later, and now charged back 3 more today. We have proof of delivery, proof of communication, and have submitted our evidence against the 1st 5 open cases from them.

Is there anything else we should do or just do the standard uploads of email communication, billing name confirmation, etc? Is is possible it was a stolen credit card? Then why would it take 2 months for them to notice and chargeback?

We have attempted contact with the client and now they have gone ghost since stealing from us. Any input is appreciated!