The Builder have done selling stating that "Covered/Open Space Parking" will be provided, now denyin

Hi, The Sales team of an esteemed Real Estate Organization stated that "Open Space parking" will be provided to the 1BHK owners at the time of the booking. They have also made it a part of there selling brochure where it was written as "Covered/Open Parking". They have fooled the customers 1-1.5 yr back. Now, at the time of the handover, The customer relationship management team is asking the owners to buy the parking at an hefty amount of around 5L. The Builder have given the 2BHK owners covered parking (1) and have included the cost in the final amount, but for 1bhk owners , their sales team always informed them as "open parking" and said that it will be available and now, after one year, they want to change that open space to visitors parking.There are proofs of false promises made by them, through brochure or chat history or video recordings of sales persons agreeing to these. I would like to know what are the laws present in india, that can be used to substantiate the 1bhk owners appeal.