Payments from Legadima

We are working for Skynet under Legadima project management ,we started in March and we were promise to get payed by May 15th but nothing up to this point.When we make Querie nothing is being responded and we make calls we get promises tht they will send us emails and nothing ,it hurts cause we took petrol from them as we run out of money from our pockets and we owe them but they not paying us so we cannot go to work due to lack of finance and we cannot pay for our bills at all,can they plz pay us or explain to us wats the hold up due to our payments