You pay the university tuition fees when you are going to a uni. You do not have to pay an agent. I have been researching this since last year and have gone through what you are now experiencing
The only fees I have paid so far are for Czech entrance exams and these are small amounts in reality.
I got my offer for Pleven without spending a penny. If I go then I will have to do some legal work which will cost about £300 I reckon but that is it.