1. Yes, the first thing you should do is to verify whether he is really the owner of the said path/road as is being claimed by him. Moreover, 3 ft road is too narrow for easement to your property from the main road for which such arbitrary allocation of 3 ft pathway towards easement right should be challenged before the Court and file an application for staying all construction on the said road/path till the case to be filed by you challenging his under allocation of easement right is disposed off.
2. If the said road has been recorded with the Municipality as a public road, then his such claim of buying the said road can be challenged and made invalid with Court order.
3. Easement right is not only for your own movement through the road but also for your friends, relatives, associates including business associates like BSNL tower personnel. So, he can not selectively restrict any of your friend/relative of business associate in using the said path/road on which he has ordinarily allowed your easement right.