Reserve Bank Of India [RBI] — sovereign gold bond 2017 not received

Address: 500087

I am a customer of icici bank. I applied for sovereign gold bond (Sgb) under rbi's sgb scheme on 27 november 2017 through icici bank's on line mode through my account. The sr number is sr[protected]. On 28 november 2017, i got a confirmation sms on my registered mobile indicating that my application as per sr[protected] is completed. Since then i have not received the sovereign gold bond certificate. When i approached icici bank in person and through email, i was informed that the reserve bank of india (Rbi) has not yet sent the sgb certificate. Four months have passed since i applied. I request rbi and icici bank to take necessary and immediate action to confirm my investment made and issue the certificate.