scam in the name of business orders or deals

there are people who asks you about business orders following you from business Facebook post and say we want to order your products in bulk and our boss in Tanzania or UK will deposit money then thay say, the bank will delay will send through courier or private jet then you will have to pay a clearance money at the airport,they send you a picture of the parcel ,and they will be requesting food money,airtime money or transportation just know it's a scam and don't fall for it,l fall for it once and again they came after l posted my business on Facebook, lntricked them too blocked me.