I have to disagree (perhaps unfashionably) with the author's sentiment and the comment below "I really like Square, but I always have this feeling that this company is going to be oe (sic) more paypal and with this story it´s confirmed." - The customer service was pretty responsive and reasonably polite for a very fast growing company. - The author notes he has paid Square hundreds of dollars in transactions fees so…
In context, having unclear policies and unresponsive customer service at the "still-somewhat-better-than-paypal" level isn't matching the expectations set by Square's marketing.
It's a billing goof. It's going to happen, and all parties are always going to hedge in their own favor to the extent practical. Pretending that Square (like Paypal) won't go after your bank account to cover a pending chargeback is just fantasy.