HDFC Bank — HDFC fastag

I have been using HDFC fastag for the past 3 years, last week noticed that my account is blocked with no intimation from HDFC about it after multiple calls to customer care I found that I have to update my KYC, and every time I call CC they give a different reason. after submitting the relevant documents they have issued me a new fastag but still, the wallet account is blocked. I do not understand the logic of sending the replace fastag with the account still blocked, after multiple calls to customer care I have found that again I have to send documents for unlocking the account. It's really pathetic customer service for HDFC fastag just for simple fastag.I would suggest HDFC to stop issue fastag, please do not defame your bank name.