TVS — Probs after every service and no proper steps taken by company

I purchased my rtr 200 4v on 13 jan 2019 and till now my bike have total of 6 services done. First month the bike was really great. But later after every service i mean soon i take the bike from workshop there was some prob or older prob gets worst. I complaint about these prob to the workshop but no when helped me and instead they make excuse ton run bike for few days and then the probs will be gone. The bike really makes irritating sound from the body even on the minor road bumps. The handle is either too after fix or it keep making noise on roads bumps.in one year the gear sensor stopped working thrice and in second year it was forth time.in my last service before submitting the bike there was no sound from chain sprocket. But when i recieved the bike there was another irritating sound. And when notified them the prob they told that sprocket is damaged. How sprocket got damaged while it was working perfect before submitting bike to them. And they told me that often bike is damaged more when it is take good care. Also my bike had severe prob of mileage. It is used give 15kmpl milleage and whenever i complaint about this they told me that there is no claim for milleage from company and bikes of 200cc or above are not purchased to consider milleage. And this story is not of one workshop. I have visited to different workshops so many times but the workers and managers are all of same type. Even territory manager doesnt believe that workers in his company could do that. Third class service and workers from tvs