Is there case law regarding payment disputes between builders in RERA?

I booked a flat in 2012 and made full payment through different accounts (family and Pvt Ltd co.). The project was transferred to another builder. The previous builder refused to accept the payment he received. I have a handwritten MR for the cash payment but not for bank transfers. The sale agreement was registered. The new builder acknowledged the booking as it was mentioned by the previous builder during the transfer with RERA authority. The payment was not accepted as it was not acknowledged by the previous builder. A RERA case has been filed with both parties. The previous builder filed a case against the maintainability, stating he is no longer the builder of the project. Is there any case law available regarding this matter?