Nissan Magnite breakdown

So we a family of 3 decided to buy our 2nd car in January . We decided the Nissan Magnite Nconnecta model (Turbo) which costed on road 10.2L INR with exchange of our beloved Alto LXI which had completed 14 years . The delivery was done done on - 3rd January 2024 by RNG Nissan Kanpur . Forwarding to today as we speak 17Feb , 2024 5pm my dad and me started off to Lucknow from ganga bairaj route . After completing 30 mins of the route there was a sudden transmission failure when father tried to slot gears . The gear stick became free and moved like a joystick . Only 1st gear was functional and we turned back to Kanpur moving to the Nissan Dealership . Tried the Nissan roadside assistance , it's pathetic the "please stay on call" never fucntiined and call ended . The "WhatsApp assistance" message texted someone will contact us shortly but it's almost 1hr and no contact was made such . Also it's 1st Checkup , 1000km inspection was done less than 3 days . What could be the failure of such situation and how should I proceed further ? Also Magnite owners if you have experienced such issues , please do let me know .