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Hi @saif0206 , we have created this community article which may help customers in addingm mobile prepaid balance.
How to add Mobile Prepaid Balance
It appears that you're having issue logging in to My Account. Please send us a private message with your TPG customer ID, Mobile Service Number and complete address so we can pull up the account and have someone contact you to provide the correct details.
To send a PM, please refer to this link: How do I private message (PM) in the community