The public notice, issued in leading dailies on Sunday, said "such person who suspects her/his device is infected" should send an email to the technical committee "before noon of January 7, 2022".
The Congress on Tuesday stepped up its attack on the government over the Pegasus snooping controversy and demanded a probe by a Joint Parliamentary Committee.
WhatsApp remains committed to the protection of all user messages through the product we provide, the company said
In a hard-hitting statement, Shah said that the report about the alleged snooping has been amplified by a few whose only aim is to do whatever is possible to humiliate India at the world stage.