Very upset with tvs service center

I have purchased tvs victor on 10th july 2018

Within 5 months from purchase my victor stops working in mid highway.

I have called number of time to service centre but they didn’t respond positively

After number of follow-up they have taken victor to service centre in next day

After repairing of victor they give me back without explaining what was the problem and what parts are changed or repaired

Please help