Service tax of residential flat

i have made an agreement for a flat with builder in January 2015 and paid 18 lakhs from my saving and bank housing loan . in Dec 2015 i came to know that builder has sold my flat to Mrs Renu Devi in may 2015 with a registered deed. i filed a police case against him. Now the builder has agreed that he will get the flat registered in my name by Mrs Renu devi. Should i have to pay service tax of the flat.