You need to give more info. Is the raised floor solid concrete? how thick? Where exactly do you see a leak? Are the batroom drains connected to a stack above the main basement slab or to a drain line under the slab? Are the bath drains imbedded into the raised slab?
The slab is usually 4in. thick. The raised portion, you tell us. Breaking up the concrete and redoing the drain piping will cost several thousand, depending on specifics.
Yes there are "upflush" systems for showers, sinks and toilets. They are called drain or sewage ejectors.