State Bank Of India [SBI] — Regarding Fastag closure refund

I had issued a fastag from SBI. They closed it automatically for possessing two fastags. I have been doing multiple follow-ups but they are not refunding my money. Everytime I raise a complaint, they close it after a few days without resolving my query. I have sent them an email attaching all the required documents, but not getting any response.

Last SBI Complaint Number:[protected]
Car Registered Number: RJ05CB8549