Tvs Motor Company — tvs scooty pep starting problem within 4 months from purchase date

Address:

LOGESH TVS, Medavakkam, Chennai

I purchased a tvs scooty pep+ from tvs dealer (Logesh tvs, medavakkam, chennai) on may -2019. We experienced a starting problem after done the second free service like with 4 months from purchased date. We used that bike for mere 3500 km.
I raised a complaint with service center and tvs customer case as well. There tried to rectify it twice. But with 2 weeks, same problem occurs. The service center (Logesh tvs, medavakkam, chennai) took 1 month to analyze and rectify the problem, but with 2 weeks, same problem occurs. They are not ready to exchange the bike as well. Please help me to resolve this problem