Call from fake businessman asking for 3000 for transaction costs

Beware of this snario of acall from a businessman .He always send for you a message containing some false details of a store in Mombasa and the pin.After some few hours he send you another message thanking you as you are honest person.After all he told you he have reached Mombasa and get the material.He told you that he have left for you 100000 in the bank in cities.He later claim that he have forgotten to put transaction cost,he told you to send 3000 for transaction.