Bajaj XCD 125
Jerk problem and tappit adjustment

I bought xcd 125 on 26/11, since then i am facing this jerk problem, if i contact bajaj service people they are like theres no prob you dono to ride so you ve been facing such problem, till now am not satisfied with my bike performance, dono what to do??? another problem is of tapput, its making strange noise, if i ask them to check it out the are like no such noise is coming, bajaj service sucks