National Highways Authority Of India [NHAI] — fastag blacklist

Address:

Ambala, Haryana, 134003

Hi,
I use to travel from ambala to chandigarh on daily basis. I have paytm fastag on my car. From 25th april my tag was shown blacklisted at toll plaza on ambala chandigarh highway. I never had insufficient balance in my paytm account and have sufficient balance maintained everytime. I do not know why tag is shown as blacklisted. Please look in to the issue.
My tag barcode number is 10234919.

Thanks
Shashi