Hello everyone. I need all your opinions.

Q: My uncle purchased a flat from a reputed construction company in hyderabad. First installment he paid directly in the office and received a original receipt. He was introduced to a sales executive personally by the company staff . The sales executive started visiting my uncle frequently with the inputs of the site development phase so for the second installment he paid the executive in person at his home in the presence of the executive's coworker and he received the receipt for the second installment by the sales executive but the problem is that the sales executive ran away with the money and our amount was not credited in my uncles account. so the problem pertaining here is the second installment receipt is with fake signature claimed by a employee of the company . I want to know my rights as a consumer to get my money back. Honest opinions and adequate information will be respected.