Coolpad India — coolpad note 5- worst service

I purchased coolpad note 5 from amazon... I had a problem of heating nd lcd lines so i gave my phone for service near chrompet.. On 20 dec 2017.. But still i didn't receive my phone... Whenever i enquire them they are asking to wait for one week...4months has happened... But still there is no proper solution... When will i get my phone or refund my cash back... Will the company return my phone or not... I'm so much dippressed... Mentally disturb due to this... Shall i take any action against your company.. Worst company nd service... Fraudulent company... Plzzz frnds don't buy any of the phone from coolpad.. It's fraudulent company...