I have a typical problem with rodeo While accelerating

I have a typical problem with rodeo. While accelerating much friction is felt and it seems that it is struggling to pick up to 40 kmph speed, though after 40kmph it becomes smooth. Problem worsens with Pillion. Reported this to dealer/service center several times they says that it is normal and there is no problem at all. Now we have reported this issue to some senior officers at Mahindra. Hope to find some solutions for this.
Problem is that service center