Hello,
The best possible way out is to yourself approach the Service Tax Department, declare your income and pay the respective Service tax along with interest in order to avoid future consequences.
In case you do not opt for the above procedure you may sit back and wait. The department may or may not get back to you, incase they do then you will have to pay service tax plus interest plus penalty as applicable.
Trust this clarifies your query.
Feel free to call / get back in case of further clarifications.
Thanking You.
Regards,
Rohit R Sharma
BCOM, ACA, LLB-GEN, CERT. FAFP