The Entity Registration process is free on True Connect (Jio). However, for Telemarketer Registration, the charge is INR 5000 + GST for all Operators.
Yes, DLT is applicable for every Entity/Company and Reseller. If you want to send your SMS (Transactional or Promotional), you need to do Entity Registration. If you want to Resell SMS services, you need to do TeleMarketer Registration.