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If he's in Bangladesh, infrastructure is pretty bad there for bitcoin.

There's still more scenario's possible so maybe not call him a scammer too soon, he may not live on the easiest circumstances there.

On top of it read this: Bangladesh Bans Bitcoin…. Now 12 Year Imprisonment for Bitcoin Usage
http://bitcoinpricelive.com/bangladesh-bans-bitcoin/

If he needs to risk his life in prison for paying us then I'd prefer if he does not pay me at all.