Acer India Private Limited - ACER Product purchased misbehaves a lot and there is no replacement or refund

In September ****, have purchased ACER Laptop Aspire * from Vijay Sales. It was in warranty as well. Couple of months later, its keys started misbehaving but i didnt raised a complaint. But since April ****, its frequency has increased alot and after sometime it works normally again. On pressing T it opens new tabs and S it saves and on Pressing backspace nothing happens. Now this issue is raised from April and till now * to * times service engineer comes but not able to resolve the issue. This has hampered my work tremendously since my data got impacted multiple times. I have asked for the replacement or refund but Company is not supporting at all. Also multiple times videos are being sent to the acer senior authority but there is no support.
ACER is purely a Fault or Defective Products Provider Company.