IDFC Bank — Amount deducted of Rs.900

In the name of debit adjustment Rs 900 was deducted by IDFC first bank. their customer support is so painful i had to call them 5 times and they say you can raise a dispute in the app but for these debit adjustment it is not even showing the option of raise dispute since it is not the toll plaza mistake. But they told me to write an email so i did after that they are saying money will be credited after 15 or 45 working days but the sad part is my vehicle is black listed and i am not able to use other fast tag also. why it should take 45 days or 15 days ? I want my vehicle to be removed from black listing. they are saying that i have to recharge for 900 rupees in order to remove the black list. so pathetic.