Square Deceptive, Holding on to money that was paid to them, that is owed, i supplied all the information, Internet

I have run a charge for $10,000 thru square, i have used them before for a few hundred dollars at a time, i usually got paid within a few days, i got approved for the $10,000  charge, and square sent me a comfirmation that the funds would be in my account in one or two days. after a few days, i did not receive any money, They then asked me for alot more information, bank statements, invoiced wich i supllied, they said they would get back to me in a few days, there is no phone number, all comunication is done by e mail.after two weeks, they said my account is terminated as of this e mail, we will hold on to your money for 180 days.they had got paid from Amex, my customer called amex, but it was allready paid, i issued the customer a refunds, which is what square told me to do. So far the money has dissapeared.square is till holding on to it.