Yes, you may try again post 1 hour of the pledge process initiated time. If still facing the same, feel free to Chat directly from the CS section of App / Website and our team will check this further with the concern department.
For your information, please find the below availability for Customer Service. Read full post here.
Phones (022 - 48906273): 9:00 AM to 6:00 PM (all trading days + Saturdays)
Chat (via App & Web): 8:00 AM to 12:00 AM all days
Email (help@dhan.co): 8:00 AM to 12:00 AM all days (you can write to us 24*7)
Twitter (@dhancares): 8:00 AM to 12:00 AM all days