Very unprofessional bordering on boiler room practices - Developer Progressive Recruitment Employee Review

Very unprofessional and shady business ethics, a nightmare to deal with, refuse to use any other form of communication other than rushed phone calls. I was pressured to accept their offer, which the client hadn't even made yet, even though I had a competing offer on the table. Take the biggest commission on contracts of an recruitment agency I've ever worked with, as an example the contract they had with the client was charged at £420 a day with the contractor getting £320, that's roughly 25% commission which is 10% over industry standard(which in many opinion in the IT contracting sector is still far to high for companies that essentially do zero work). When confronted about the frankly huge margins they simply denied it and I was told I was being greedy by blowing the whistle on their unacceptable practices.