Is there any law where a customer is liable to get the relief period between two construction slab

I purchased a flat and selected mode of payment slab wise construction means as slab will constructed demand will be raised and payment will be made. after taking booking amount, builder did not raised any demand by construction phase. So i reminded him about demand letter if any, On enquiry i found that my flat was not registered in builder demand letter generating software. So i did not get first construction demand letter till date. He added the same in second demand letter. with penalty. I told him this is wrong please give me time which you promised between the construction slab at the time of booking, My payment mode was as par construction slab. He kept penalizing me and did not give concrete reply. I told him to reply my query about unnecessary penalty and give me time. He did not answer to my query till 1 years. In mean time he kept on raising penalty daily basis. after 10 month penalty reached to 70 thousand. I told him to cancel the same. he said i will not cancel it and give me waiver of few thousand . and he is forcing me to pay. 1) after taking booking amount if builder does not follow the payment terms, can a legal action be taken against him. 2) I asked him to give me the time which he had promised between construction slab. due to his negligence he did not raise demand letter on time & now forcing me for the same. 3) Is there any law where a customer is liable to get the relief period between two construction slab where builder can not force for his negligence to generate demand letter on time.