Bad ImeI help! What to do?

curlybaby26

    Bought an LG G6 phone that's locked to T-Mobile and when I tried to get it fully hooked up to the network there was no activation card in the box so wen I contacted T-Mobile they said it had a bad IMEI but I cant return it now to get money back but the seller said this "Phone is good, how t-mobile can says like this?! Just pop they're sim card and it's going to work",what do they mean pop the sim card and it should work? Any help would be really great!

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