Bandwidth Issues In Websites

Hello Bidders, We have some websites on our hosting server, which have bandwidth issues. Means some of the sites are using highly bandwidth Than they should use. Those sites are basically Wordpress Sites with Themes. We investigated the issue and come to know that some are due to Imaps and Some are due to HTTP for high bandwidth. Can Anyone help us..This is urgent issue and because of this our sites reached to maximum allocated bandwidth and server has down an closed the sites. Happy Bidding/ Urgent Reply Needed