Hero Motocorp — Front wheel and tyre problem

Sir.
I brought a new vehicle that is passion expro in september 2019 by cash. Till date i'm facing front wheel and tyre is not properly fitted. And thus air pressure is not stable more than 2days.. This problem is occurred when i purchased the vehicle..
Authorised dealer survicer says that this is chargeable survice.. So u have to pay and get survice.
Now i payed and survised the bike... Now also facing the same problem.
And also they collected amount for free survices too.
So pls help me to get free from these problems.
Thank you
From: pramod c p