Ants destroying hibiscus plant

Though the seller promised that the hibiscus plant would yield flowers through out the year, a parasitic variety of ants has ensured that the plants do not yield a single flower for months after they attacked the plant.

The plant was flowering regularly for a month after being purchased, before the ants discovered the plant. They then systematically covered the plant with a white web like substance especially the tips of the plant where the buds and flowers would bloom. removing the white layer from the plant stems has not improved the condition and though the plant has leaves, there are no flowers at all.