I am facing problem receiving money in e-gold.

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It starts when donkeymail said they said they paid me 17 cent in e-gold but when I checked my e-gold balance found it was zero. After one month kooplink send me 5 cent and this time also condition is like previous. Atfirst I thought that these is the problem of these two sites. But finally when seven-bux send me 3 cent & I received nothing then now I think e-gold has a problem. Are there any minimum limit to receive payment ? Why they not give me any of my these payments? Anyone experienced it before?