Still, I have neither received the Tag nor any reply to my 3 complaints from ICICI.
Suddenly, I remember the Paytm Fastag Tag which was taken by the Tata Dealer when I purchased the Tigor (even that time, Fastag was mandatory for registration). At that time I tried to load documents but Paytm system was not accepting the docs online and I was told to visit any of their local offices. The nearest Paytm office was some 40kms away from home, I didn't try that way because at that time it was not a must for me to use the tag and then I forgot the matter.
Today, I found the Paytm Tag in my file and wanted to try to load the documents again to see if I can use it now. I then logged in to Paytm (I had the password registered previously with them) and it's showing a balance of Rs.150/- available, which means the Fastag is still valid?