This agency did not provide accurate information a...

This agency did not provide accurate information about the rate of pay for the job I took via them; they failed to inform me that holiday pay would be automatically credited to my hourly rate, they did not inform me that a third party company would be used to arrange payment of my wages and furthermore they did not inform me that a deduction would be made from my own wages to pay that third party payroll company EVERY time i was paid (WEEKLY). Additionally, a deduction was made from my wages labelled "employer's NI" on the third party payroll company's "reconciliation statement" - this was a sum of money deducted by that company from my wages EVERY time i was paid (in addition to my employee NI contribution), i.e. they made these deductions weekly. I was not informed by the agency that money would be deducted from my earnings for either the payroll company's fees or employer NI.
When I contacted the agency about this, I was told to contact the other third party payroll company, who told me to contact the agency.... The third party payroll company told me that these deductions were outlined in the contract i signed: I have had the contract checked by several people and no such clauses exist. Numerous times i have contacted both, been told the person at the other end of the phone is looking into it and that they will call me back, and they have never called me back.