Hi @Svapnil_Kambale you are right, the basic version of Asana is free for teams of up to 15 members. In order to investigate this further, I recommend you contacting our support team: How to contact our Support Team email . Unfortunately I don’t have the tools in the forum to have a look at your account setup and confirm what could be the issue here. Apologies for any inconvenience!
I hope the issue is solved soon! Let me know if you have any questions.