Bajaj Pulser 150
Ad performance of my new bike

I harsh vardhan purchased a new pulser 150 from fair deal jheel.but bike is not going well. it dont have acceleration like previous bike .pick up in second gear is nothing and average is not well. even i complain about the same in service center but they dont bother about it.and they say "this is new pulser pls dont compare it from older one".but now i purchased this bike what is my fault.now it giving abnormal sound from engine in second and third gear. pls solve my prob as soon as posible.tx