very hard to help without seeing the actual T&Cs. good luck
1) do photographers look for models or things to shoot...yes we do, all the time
2) do photographers market themselves to make money and sell their prints or services...yes we do, again all the time. whether it is a sign, an ad or making phonecalls, or putting up an online gallery or portfolio, they are all means to market a photographer or the company.
in my opinion you have no defence or just cause to walk out. it's to easy to shred the two premises to your defence and i am not even a lawyer. if your employer is having you do those things that you mentioned, then he is training you because as i just showed, they are what a photographer does. we all look for things to shoot (models), and although we all may do it in different ways, we try to market our work (telemarket).
...sometimes we don't start on the ground floor, we start in the basement.