Need advice,

Bought a few bits an bobs off someone on here through paypal and turns out some of the stuff is beyond use and also some of the stuff never arrived, now we aint speaking £40 or £50 here, I have tried to contact the person by text, pm's, e mail, + asked one of his associates to pass a message on (which was done i trust) but so far no reply, i dont want to make a big deal of this just want it sorted out as the bits are required for my engine build like yesterday, from what i hear the individual works away but surley he reads e mails, pm's or text messages?

Any positive advice on how to rectify this issue would be greatly appreciated.