There is a way to complain to cash app for any payment and get refund from cash app, this method we call cash app dispute .You should know that you can dispute the transaction of money with the cash app. May it be surprising to tell you that all the problems related to cash like payment failed ,Disputes for pending and disaster and Status of refund pending .In this situation, you can dispute with the cash app. In case there is any problem related to refund then you can call Cash App customer care center .