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Car parking

I am living in this society in kalyan for the last four years and offlate i have purchased an unsold parking from the builder and got it registered. now the society says that it is illegal and they will continue with their plans of extending the society office on to my parking. the conveyance deed is not yet done. the society had mutually decided three years back that none of the members will pruchase that parking so that at last the parking will become the soecietys kitty which i was not aware of due to my proffession, and they will go ahead with their plans. now they have issued me a notice to vacate the parking. please advise.