Nigerian Scammers! They are working together in the UK and there Nigerian place of business.
They will keep coming up with excuses for you to send more money, and finally when you think that's the last of it...they tell you they didn't receive it or it was sent to someone else. Finally I got fed up after waiting over 2.5 months for my phone order. I asked for a refund and it consisted of a counterfeit cashiers check.
They tried pulling the bad check scam on me, but I was too smart for that one. I wasn't sending them anything...because I knew the check would never clear, and sure enough the day after it cleared from my bank...they called to tell me it was counterfeit.
DO NOT SEND THESE SCAMMERS ANY MONEY!!! You will NEVER see it again!!