Indian Bank — OnePlus refunded the money but not credited to my account so far

Address:

Indian bank, 1935 1 Trichy Road branch, 641045, Coimbatore - Tamil Nadu

Dear Sir/Madam,
I've ordered the OnePlus 9R mobile with case (INR 40789.00) through OnePlus official app on 23 June 2021. By mistakenly I've chosen different color so I've cancelled the order with 5 minutes after the payment is done.
After long follow-ups with OnePlus, they've given the reference id is
1. Refund order I'd: RO2021062309135037890006
2. Bank ARN no. 30005411801174142150163

After that I've mailed many times to the bank but no response from Bank side still. It has been 11 days more.

Please help me in this pandemic situation.