i have worked for Kelly Services, Adecco, REED, Office angels, manpower and SEARCH and i have never ever been told that i am to contact the client aswell as the agency temporary division.
Whilst i have sometimes called the client first if i have worked on a long term assignment and in good rapport with thm this has been off my own back as i know how rubbish the agencies can be at passing messages on.
Th agency earn about 40% of your hourly fee. i.e you get �8 and they charge �11.50 + vat for you. They expect you at cost to yourself to make 5 calls on a day where you are poorly.
Your contract is with them, and the clients contract is also with them. You being the middle man 'worker' are not expected to be the go-between between their contracted terms.