Rip Off service charges on leasehold flats

I own 2 leasehold flats in a block of 9, there is also a separate block of 9 housing association flats, and 11 houses (houses only contribute a small figure to the service charge)

My problem is that the yearly service charge is now just under £2,000 pa not including ground rent. I have flats else where and I’m paying approx £1,000 pa service charge on average so I’m getting increasingly frustrated by this £2,000 service charge. When I question the management company they just fob me off with excuses like oh the landscaping budget has gone up or the insurance has gone up blah blah blah!!!! I have had several rows with the management company about the quality of there works so the fact that I also think I’m being ripped off is very frustrating. Getting rid of them would be ideal but I do not have the knowledge, time or patience to contact and then get together with the other residents and form a RTM etc… Is there something a bit easier and quicker I can do to get this management company in check, I’ve heard about Leasehold valuation tribunals but is that the correct route for this problem and can anyone tell me how it works? 

Or is there a quick way of just just simply sacking them and getting another management company in, I always thought the management company was employed by the freeholder so would that be a job of the freeholder?

Thanks in advance

Rob.