PhonePe — phonepe has stolen your money

We are an ngo and we sell products made by adivasis. All proceeds of sales go towards making their lives better. We just had an exhibition where we were accepting payments from phonepe, paytm and google pay. We have received all amounts into our bank account except the transactions on phonepe even though it showed "transaction completed/successful" on the customer's phone.
After checking all bank statements and tallying everything we have tried to contact phonepe customer support but they make you dance around from their merchant call center to their regular call center and are all very rude to you on the phone.
In the end they told us that it isn't their problem and that we should go and contact our bank.
To those reading this, please be wary of such application that are run by criminal management.