State Bank Of India [SBI] — Fastag service is sham in sbi (NO DUPLICATE TAG /BLACKLISTED ISSUE/ REFUND ISSUE) )

My car windshield is broken so I was in contact with customer care for duplicate tag process after 6 months of struggle with no legitimate response I decided to surrender my fastag. I surrendered it on 15th of april 2021
17th April 2021 I got the message that your tag is blacklisted and surrender and refund process is initiated within 3 working days.
After 15 days with rigorous calls and messages to agmit.[protected]@sbi.co.in
For refund and blacklisted issue.
With no response from either site, I came to know my refund process is stuck due to wrong input of cancelled cheque

Now I am stuck with the blacklisted tag and no refund
Still figuring out the different way
As sbi fastag hardly contact through mails
Kindly help with the process
I just want to surrender the tag