Lenovo — Lenovo Ideapad 330S. Laptop not Charging. Charging adapter is working well

Laptop not charging, adapter working well. Registered complaint on mail, but no reply yet, customer care people aren't taking the issue seriously, I have to repeat everything to every other executive. They said, company will send engineer for replacing motherboard, it's been a week and no one came yet. I called them again, they said troubleshooting not done, address that I've told them previously, they noted wrong.
This time I've got them corrected with address.
Hope engineer come soon.

Why there is no reply on mail ?, I've sent mails 2 weeks back but still no reply.