Professional Fee\Legal Consultation Issue

Hi, My brother has a property issue with a leading builder, against which my parents took advise from a relative to consult with a lawyer last month. My dad spoke with the lawyer and he advised to come visit to discuss the matter. There was no discussion about the legal consultation fee involved. During the visit and discussion, the lawyer asked for Rs. 3,00,000/- to go ahead with the case and file legal proceedings against the builder. My father thought that the amount was higher than he was anticipating or wanting to afford. Post which, he said that he had a consultation fee of Rs. 11,000/- which will be off-set if we went ahead with the case. Although he was willing to negotiate on this Rs. 11,000/- consultation fee. Never before this point did my dad know or was informed about that there was a consultation fee involved to even see a lawyer. My dad had asked our relative who had referred us to this lawyer to discuss the same with him and find a middle way out. That also didn't work out. Now he ask send a notice with invoice amounting to Rs. 22,000/- asking to be paid immediately. Please advise what should be the course of action further.