Dell India — Regarding disappointment from Dell services

Address:

Amritsar, Punjab

Worst experience with dell technical support.
I m using dell inspiron 15, service tag no. 7pz0512. I found my pc have some problem, not working properly. So i called technical support on 8/7/17, they told me to call on 10/7/17. And on 10/7 they again told to call 11/7. Why u don't help out warranty systems. Where we call? Should we call to hp, sony? Solve out my problem, i m trying from last 5 days to connecting dell. And also give some manners to your technical representatives.
Biggest mistake to buy dell.