Does anyone have any idea about this scam and how to block the bank account

My uncle got an apk file through whatsapp and he input few details in it and instantly his number got hacked and also his bank accounts and lost 40k rupees. And he immediately went to get his number blocked and also his bank account but he doesnt have his registered mobile number with him so the customer care support is not connecting and it is sunday he cant go to the bank. He tried to block his number but idk how but he kept on reactivating the sim and my uncle somehow debited all the remaining amount from debit card through atm but he s scared that he would access his credit card too. And he gave cyber complaint but they are slow too.