Notice to return defaulter u/s 46 for not filing of return gstr 3b

Sunil (Proprietor) (35 Points)

18 May 2019  

We received a mail with the subject "Notice to return defaulter U/s 46 for not filing of Return GSTR 3B" from Department of Commercial Taxes, Bengaluru (From a valid ka.gov.in email id) saying that we have not filed GSTR3B for the month of March 2019.

But, we had done the GSTR 3B filing for March 2019 on 7th Apr itself. 

We have replied to this email with the necessary information and also proofs (GSTR3B filed PDF, and also the ARN details)

Is this enough or is there any other procedure left to be done to clear this notice?