Dell laptop internal speaker and some keys of keyboard not working

Hello ,

I have Dell Inspiron 3543. purchased on august 2015 . Its speaker and some keys of keyboard are not working . I updated all the drivers. I did Laptop's factory restore step. But none worked.  

I had shown the issue to few hardware engineers for issue confirmation. They all said It has keyboard and speaker issues. Contact to dell support as one year is not completed.  But Dell support is saying the product is not under warranty and contact dealer.  I contacted dealer. Dealer said we have updated the warranty.

To whom should I contact now? How my issue will get resolved?