Complaint Review: all about maintenance

These people contacted me and asked me to submit a bid to replace two doors at a Fortune 500 company in my hometown after submitting the bed in receiving an acceptance email and a purchase order I spoke with several people on the telephone and signed an electronic purchase order a green to the terms and conditions and proceeded to do the job after purchasing the doors installing them paying the locksmith to come out and rekey all the locks paying my helpers and buying other materials and supplies I completed the job successfully and had the boss man over the plants signature signed off on the work order and I proceeded to submit the invoice the same work order and a W-9 and a Certificate of Insurance to all about maintenance and that was 6 months ago we still have not been paid. Hindsight's 20/20 I should have checked into the Better Business Bureau or looked around online before I accepted to work a word to the wise any of you that are contacted by the Joseph dasilva steer clear from he's a scam artist and getting rich off our backs and our bank