Sold my site to be used as road for his adjacent apartment

Builder approached with favour to sell our land so that his apartment will get approval to build 8 floors as for approval it demands 100 ft road. There is already 40 ft road once he purchases our 60 ft he can submit documents for necessary approval. We were persuaded and we agreed to sell our land and executed a proper sale deed and registered . We asked builder to mention clause that this land will be used for road only and we will be given access to use as this 60ft is the entrance to our house. They said they will mention this clause in separate document but they prepared this document signed and got notary but not registered. Now dispute is builder got approval for only 5 floors and the existing 40 ft road is sufficient and now he’s trying to sell off the 60ft road which he bought from us (2.5 cent). He’s saying he will provide only 10ft for our use and sell off remaining. If he does just before our door there would be any building or high chances of wash area or toilets to be built. Since our secondary document signed by the buyer has all the clauses but it’s not registered Will it be considered as a proof in court. In this regard we were been cheated forged we lost our peace and health. We want this land to be used only for road purposes as it was intended while purchasing.