The agent wants money for absconding removal. What to do?

Dear sir/madam,

I came here with a tourist visa and I have overstayed. The office which did the tourist visa for me put absconding on me. I went to immigration for absconding removal and they directed me to go to the agent who did the tourist visa for me.

When I went, he asked me to pay 4300 AED before he can issue a paper for me to immigration to remove my abscond.

I want to know what can I do.

Immigration has told me that the absconding fee is 541 AED.