Skoda India — noise in the gear

my vehicle no is ka 05 mp 6215. service provider is tafe access. there is a vibration in the 4th gear position in my skoda rapid car.this was there since begining. i had give the complaint in the first free service at 7500km but it was not rectified.at the second paid service also this was highlighted and the complaint was taken but nothing was done to rectify the problem.please advise the further action on this. rgds satheesh .