the yellow eggs may be plant food in the compost when you bought them, the flies in the compost may be due to overwatering and keeping plants to damp-let them dry abit before watering if they are white flies on the leaves this is a different problem

Sounds like Fugus gnats aka sciarid flies. They are tiny black and jump when disturbed. You need to find a suitable insecticide to get rid of them. Covering the surface of the compost with a good half inch deep layer of grit also helps. The larva by the way eat the plants roots so if there are a lot of them then the plant suffers.
The yellow eggs are most likely plant food.

Thank you very much for your advice. The flies are tiny white. Can i re -pot?

Thank you again.

In that case they sound more like white flies. Sciarid flies are black. Same advice though, you need to buy a specific insecticide for white fly. They are difficult to control as they breed so quickly.

Thank you very much. I will get a insecticide immediately. I have placed the plant in my garage for now to stop it spreading to another plant.

Thank you again.