You could see if the property owner could help apply pressure to the agent.
If my agent did that to our tenants I'd be pretty unimpressed to be honest, and make it clear I felt it rather unfair - unless there is a good reason it needs to cost this much?
E91 330d Touring M Sport Auto 2006
225M 19" MV4 + Falken 453
M3 270M 18" rims + Vred Wintrac Extremes