Land title is in my name but the patta is not

Since the purchase of land dates back to 1995 and someone (neighbour) is using it, they (neighbour) can claim adverse possession, it is better to get the land endorsed / mutation sanctioned in your name in revenue records.

Thank you for reply!

How can I get the land endorsed/mutation sanctioned in my name?

I am currently away from my village and can not access my sales deed promptly so is there another option other than for applying for patta online?

You can apply for name transfer of patta to your name from your vendor's name. 

You will be guided with further formalities after that

Thank you for your reply!

Do you recommend I do it online through the tnreginet or eservices website or through Tahsildar? 

You may first start the process by whichever mode you may choose,  if one fails you may opt for other. 

If the other one also fails then you can approach court with a suit for mandatory injunction to direct concerned Tehsildar to do the needful. 

It is better to consult and engage a local prudent lawyer for proper appreciation of facts/ documents, professional advise and necessary proceeding.