What to do when Chatr SIM won't work on the Xiaomi Redmi 4 bought from India?

I have bought redmi 4 from india And now i am in canada i put chatr sim in redmi 4 but it is not working so please help me and tell me what to do

Hmm.. I think it should work with Chatr's 2G and 3G, but not on 4G. Please contact Chatr and report the issue.

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