Source: http://alexshvartsman.com/2014/02/11/scr...

Square has a slightly different procedure. For each chargeback, they provided a link asking me to fill out a survey and provide supporting data such as invoices, receipts, and communications with the buyer. None of which I had, since the entire transaction was handled online, directly through Square. That’s OK though — their FAQ suggests that even without additional documentation, they will represent the seller and try to resolve the dispute on their end — just like PayPal would.

Unlike PayPal however, it seemed that they just withdrew the disputed funds from my store’s bank account, without any additional follow-up.

I wanted to call and speak to their fraud prevention department in order to figure out how we can best comply with their policies to avoid future problems. That’s when I discovered that Square didn’t really want to talk to me.

....

So not only has Square done nothing so far to help me resolve these chargebacks, not only did they withdraw 100% of the funds in question from my bank account, but they also punished me for being a victim of fraud by shutting down my account without advance notice, even though I have processed hundreds of legitimate transactions with them before and since this incident.