I got an appointment letter from midland oil compa...

I got an appointment letter from midland oil company last week , and afer signing the agreement letter and all they gave a nunber of some one named Andrew walmark from.visa work permit department, i called him and asked the procedure he asked me to send my passport copy and appointment letter copy , and asked me to transfer 35,000 for visa processes. Is he relaly working there , i want to know wether he is a fraud and cheating me by the name of that company. Pls let me know about it