How to refund or replace my Lenovo ZUK Z1?

I bought this phone 4 months before. But since from.beginning it is showing problems like hanging, heating, auto switch off, auto reset ,and most worst is that it gets switch off after disconnecting every call

Hi vijaymundhe. I think you made a huge mistake here. When it was malfunctioning since that beginning, you should've taken the phone back to the store where you bought it. Anyway, you will still be covered by warranty (if you are still in it). Contact the store where you bought it or directly Lenovo to know where you can bring your phone for repair.

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