Central Bank Of India — charge dispute

Sir,
Vendor (Amazon.in) has issued me refund on 28 march 2020 and i have received the confirmation mail of fund issued from them and i also have the refund reference but till now amount is not credited into my account by bank and i am trying to contact bank customer care from last 8-9 days but call is not connecting so i am providing the refund reference id and some other details which will be useful to you. Please help me and credit my refund amount into my bank account.
Thanks.

Name - amit singh
Account no. [protected]
Ifsc code - cbin0284461
Refund reference # 7be7kjdy0000k78i27f0
Date of original payment by me - 20 march 2020
Date of amount issued by vendor - 28 march 2020
Amount - 1799/-