For bike parking issue

Hello sir, I have purchased a flat in 2018 and we all flat owners are facing bike parking issue.issue and all apartment details as below. 1.it is G+5 building and 23 no flats. 2.in first it was G+3 sanction plan but after some time during construction builders plan changed with some fine and made it G+5 ASMADE plan. 3.As per G+3 plan in ground floor there is full area for parking but in new ASMADE plan there is shown shops and flats and a small parking. 4.Now shown parking has sold to landlord by builders and he is saying nothing in his hand. 5.In all flat owner deed there is no mention for parking place.but as it residential building as per first sanction plan but now it is residential with commercial. 6.lanlord having 5flats and 2 shop and they are deny to pay maintance fee. 7.for 23flats there is only a gully provide by builder so we all facing problems. 8.can we file a case against builder for this. 9.he also sold shown parking to landlord. Please suggest me what is rule and law and what is chance . Thanking you.