Maruti Suzuki India — It working only in one toll gate and in other toll gate not working

Address:

main road,, sundakkam palayam

I have issued my hdfc fastag two months back and traveled with this tag couple of times. It working only in one toll gate and in other toll gate not working. Sometimes it shows tag is in blacklist or unknown tag.

Really i dont know where the issue whether its with fastag card or toll booth scanning machine.

Every time struggling a lot while travelling. Please check and let me know for permanent fix.