Can visitors be legally barred using apartment elevator?

We reside in the third floor of a G+4 building consisting of 16 flats. The Society Governing Body has recently notified that nobody else except the members themselves in person will be allowed to use the single elevator. As a result, the milkman, newspaper vendor, housemaid, the courier/postman (delivering cheque books, insurance papers etc.)and the service persons (for water purifier and other gazettes) all either stopped coming to my apartment or have threatened to do so telling that this is inhuman and discriminatory. The Society Governing Body circulated a paper with the above decision and more than 50% apartment owners signed in support of it. My questions: 1. The lift or elevator in question is made for the use of the society owners. If any service person comes to my house for providing service(such as a pizza delivery boy) by using lift, can it be taken as the lift indirectly used by me? In my sale agreement and deed of the apartment, the lift has been included in "common area". Canthe society legally restrict the use of common area by any member? Tomorrow, can they make any such rule for the staircase(the other common area) as well? (I think we cannot distinguish elevator from staircase as both are common areas and any flat owner must have equal right on both.) What is your take on that? 2. The notice displayed specifically mentions the words "vendors","labourers", "servants" etc. barring them from lift use. Even for entry in temples owned by trusts such discrimination are not allowed by law, even if these are not public place. What is the legal stand (about human rights) in this case? 3. As I pay the society dues regularly, can it be construed as defiency of service? 3.