IRB Infrastructure — Not allowing fast tag and charged for the same

I travelled on MUMBAI PUNE express way on 7/04/2023 in my car MH 04 KR 6229. Inspite of having sufficient balance and valid Active fast tag I was asked to pay fine of RS 480 while going to Pune . While coming back again same problem happened and I have to pay in cash .
When I raised query with toll plaza supervisor he informed that fast tag is on vehicle number and not on chassis number . I spoke to fast tag executive he said fast tag is valid and active .
Few months back I traveled in same vehicle with same fast tag .
Want IRB infrastructures to look into matter and provide Valid information. I have receipts to support .