What I gonna do with my Nigeria client?

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v%{4]Y"z,[ Thank you for the mails and sorry for my delays, it was due to I want to our head office to confirm the order so that we will prepare payment at once.CJ0Xl%kBl
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But we are told by our board executives that the contract is o.k. and the money was today approved but with a condition that we will pay deposit in cash to your company and balance in t/t, the reason is that we must visit your factory or office in china to inspect the quality of the items that you want to ship mass produce for us and if the quality is o.k. with what we read on your web information and the continent is good, than we will make the deposit payment and return back within 5 working days.Deq `2O|HU
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So for this reason we are plain to visit your office this month so that we will be able to come and return back on time, so what information do I need to send to yu so that you be able to prepare an invitee letter for our trip to your office as soon as possible now.
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7YZgmTC Tank you and note that your very urgent reply is needed now..
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Benson?-C
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I was so glad that the client Benson agree all the terms including prices and we were planning to sign the contract before he said they must pay a visit to China. What do that mean?
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3k,F#rq M$Q Benson is from nigeria, He asked me for a invitation letter so that they could visit our factory before placing the ORDER and pay the money.
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I have written to him, coming & goings, for more than a month!! But I dare not trust his words because I heard many stories about "cheating for invitation letters".  Hj"cU6kSZ7Jg

4l*ZZ+D AG T` Benson had wrote me and explained his idea. He said he could t/t 500 usd to brush off my suspicion+d#xU8X8H#m K

/f7YS{wL~NkP Can I trust him?  
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I foud myself really can not bare for dropping this customer.
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+nh+E!xP#\B What I gonna do ?