<human>: Can you provide a brief overview of the text?

I have been working as a contractor for a company for the last 18 months. Last September my contract has been renewed and I was asking for a raise which I was denied. I was told the client was unable to accommodate a pay increase. 

Since the beginning of the contract have I been paying 300 euros monthly as a flat rate agency fee but just recently (after 2 months of not getting due to their incompetence) I have found out that they have been taking 80 euros of my daily income. This really ****es me off and seems like an absurd amount. In a 20 day month this amounts to 1900 Euros in agency fees! Yet still they denied me a raise, not even 10 euros more per day.

I have written a complaint to them and demanding a raise of 50 Euros/day and 50 Euros for each day I have worked since last September. The agency replied by saying that their super busy manager will get back to me "soon". Well its been two weeks now of me trying to get in touch with him and he finally agreed to call me this weekend... 

Anyway, I am looking for some advice as this is my first gig as contractor. Am I asking for too much? I don't understand how they can justify taking this large chunk out of my salary. Why do I have to pay them a monthly fee if they are already taking about 26% out of my daily salary?!
<bot>: I found out my agency is taking 80 euros out of my daily paycheck on top of a 300 euro monthly fee. My goal is to reduce this to 30 euros daily + 300/month. Is this unreasonable?