Same scenario with me too, below is the 1st email which I received from them:
Dear NITIN SHARMA ,
We refer to your IELTS test of 18 August 2018 .
Strict quality control procedures are in place to protect the integrity and security of the IELTS test. As part of these procedures, test results are routinely analysed by the IELTS Test Partners before they are issued to candidates.
As a result of these procedures, test scores for the 18 August 2018 have come under scrutiny and are being investigated. Your results are being withheld while this investigation is being conducted. Please note that all investigations are conducted without prejudice by the IELTS Test Partners.
The declaration on the IELTS application form that you agreed to includes the following statement: 'I understand that my results may not be issued 13 days after the test if any of the IELTS Test Partners deem it necessary to review any matter associated with my test'.
We will provide an update on your results as soon as the investigation is complete.
Yours Sincerely
IELTS Investigation Team,
British Council India
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Here is the 2nd email which I received after 3 Hrs:
Dear NITIN SHARMA ,
We refer to your IELTS test of 18 August 2018 .
Further to our previous email, please note that we will share the next update with you on 14 September, 2018 .
Yours Sincerely
IELTS Investigation Team,
British Council India