Advocate demanding for more fees than what he said

Hello, A year ago one of my friend's brother's wife has complained a false accusation on his father, mother and himself demanding for money. In the meantime, they have hired a lawyer to fight the case. But the lawyer didn't advice the family to file a case (broking their trust). He was applying for bail petitions 3- 4 times both in district court and high court. But only my friend's mother got bail and the rest didn't get. He has told them that the only way to get you out is get arrested or through station bail. After all that, it seems he has advised them to apply divorce. They have paid him half the amount of his fees for divorce. But, the court has returned the file due to some correction. Later, the have lost their hope and they have compromised the opposition party through their neighbours. In the meantime, the other party too agreed for mutual divorce it seems. Now, it seems like the lawyer is demanding more fees. The fees structure what he said before and what he claims now is different. They have paid him by cash and through online transaction. He hasn't signed or got signed from the party for accepting the fees terms. Now he is claiming more. Furthermore, since he didn't correct and apply nor appear for the first divorce petition, and he prepared a new second divorce petition for mutual. When asking him about the fees paid for the first divorce, he doesn't speaks about it. My friend is literally upset. And they have lost trust on him. When asking him to provide NOC. He is asking them to pay the fees of his new structure. And the whole family is worried about whether he will cause any trouble. Till date they have paid him more than his previous fees structure. What to do? Please anyone help them?