[Resolved]  HDFC Bank Fastag — hdfc fastag closed as blacklisted

I was frustrated with the experience using hdfc fastag, eventhough my fastag had more than 500 it was always blacklisted and everytime i ask them, it is due to non-usage which is false because i use it very frequently.
Finally decided to close and get fastag from some other bank, raised a request to close. Found out that they closed my account as blacklisted. Now i am not able to get another fastag. Tried to call customer service for more than a month and they are not reachable. Need resolution immediately.