State Bank Of India [SBI] — Not received coupon payment since I have invested

I have applied for 'GoI#2.5%SGB 2020-21 Series V 2028 loan code-29278- Red Date 11.08.2028' in August, 2020 for (x) units and units are credited in my demat account. I have purchased SGB through Bank's internet Banking. According to rules, I was supposed to receive fixed coupon payment of 2.5% semiannually in my Bank account, however, I would like to inform that I have not received any such payment since I have invested.

I request you to kindly look into the matter and guide accordingly.

Thank you