Parking possesion denied after registration

If the parking space is part of the sale deed and it is clearly mentioned in the sale deed about the alllocation specifically, then the landlady cannot refuse to allot or handover possession of the parking space. You are one of the owners in that complex hence she cannot claimm poroprietorship of the entire complex including the parking spaces meant for other owners. 

You issue a legal notice demanding her to handover the possession of the parking space as per the registered sale deed condition failing which you may approach civil court with a suit for specific relief directing the landlady to deliver possession of the parking space as per the conditions of the sale deed.  

File a suit for possession / specific performance of contract qua parking slot through a local prudent lawyer.

You can also move to jurisdictional Consumer Disputes Redressal Commission for deficiency of service.

However, sale of parking in a multi-story building is illegal. 

Thank you both for the valuable suggestions. Payment towards 2 parking spaces are clearly mentioned along with the amount for each parking on the sale deed. since it's not an apartment and independent building still can I file a case against consumer forum against land lord ? Is it parking sale in independent building also illegal? 

You can file a suit for possession of the parking spaces as per the provisions of specific relief act and for the costs towards the litigation against the landlord 

You may discuss with a local advocate and proceed as suggested