i need help

I own a beat Lt petrol version purchased in august 2010, the vehicle has crossed 47000 km as on date ,From the first service which was done on 1000km at ashtavinayak motors / mira road I’m complaining of a knocking sound when moving the vehicle in 1^st gear, they did some engine tuning and gave back , since then every time I’m complaining of the same complaint, but so far no use, in the meantime due to regular complaint the vehicle was parked at their work shop for almost ten  days a replacement vehicle was also provided to me by the workshop manager mr sangram , and was returned back to me saying the problem is sorted out, then on two different occasions they offered a vehicle pick up and drop , still im suffering the same problem, they are unable to identify the problem. The call center females call for service feedback , and when I highlight the issue they say , I will spk to the manager and get back to u within 30 minutes, which they never do.

The problem with my vehicle is when I start the vehicle in the morning for the 1^st 25 to 30 kilometers the vehicle runs smooth , and then onwards it start to knock when lifting the from 1^st gear, also there is weird sound which comes when even if u are on 60 km speed on 4^th of 5^th gear , if u suddenly apply a bit more acceleration there is different sound which comes , this issue was also told to them , but they cud not find a solution.

I a writing this letter hoping to hear from you a favorable solution to my problem.

My vehicle number is MH 04 EQ 1794

RITESH SUKUMARAN.

8805278808/9320175713

good stying both interior and exteriorless space, no ground clearence, no good pick up