Firstly, note that this act may amount to the offence of criminal trespass defined in Section 441 of IPC and punishable under Section 447 IPC. So, you can initiate action for this offence against trespassers. You may also take steps for their eviction.
Since it appears to be a vacant residential plot, you may put a fencing wall around it so that outsiders are not able to trespass the land without your permission.
If the registration and mutation are in your name in the relevant records of the authorities concerned, it may not be possible for the encroachers to change the records in their names without your permission. You may inform the authorities concerned about any possible fraud / forgery in this regard, requesting them not to transfer the same without your permission. Also keep a regular watch by periodically checking the plot physically either yourself or through your representatives.
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