Honestly, the instructor/flight school should have already spoken to the student pilot by this time concerning his progress. If there has been no discussion it would look like to me that they are not too concerned about their customer and are just trying get every bit of flight time/cash that thy can.
However, if there has been continuity of training and the student has not soloed, I would talk to the instructor about my progress and either ask to fly with someone else or even try a different flight school and get an honest second opinion. Not everyone is cut out to fly.