Parking allotment issues

Hi, I bought a 2BHK flat in Bangalore with one open car parking which he charged separately. While buying it was told that only open car parking for 2BHK and didn't provide an option for closed parking but asked to send an email for closed parking in case available during allotment. But I see most of the 2BHK people got closed parking that they negotiated during the flat buyout when flat was not getting sold during currency demonetization. Now builder is alloting the parking slots but when asked for closed parking, he is asking almost double the initial price that too back to back option, it means I had to pay for 2 parking for double the amount. But for the people who already bought closed parking and requesting for extra close parking for them he is giving at the same price. when asked reason for double the price, the builder response was "demand is more so the ask". Please clarify queries. - Can I file a case against the builder for not giving an option for closed parking though he has given some during negotiation? i.e. not alloting the parking evenly across all 2BHK. - Can he charge for open car parking allotment (I read somewhere he shouldn't) - In some cases, I see he alloted car parking more than 2, but he doesn't have an option to provide one for the people requesting for closed parking instead of open. I see builder is not alloting parking evenly across all flat owners, please suggests on above queries or let me know any lawyer whom I can contact in Bangalore. Thanks...