There are a lot of openings in ACS and what I have posted is just one of the nearly a hundred campaigns they are handling.
Don't let your lack of call center experience be a hindrance in finding yourself an employment.
You can take the exams for the E-mail Support post even without call center experience. Even if you will not be able to meet the requirement for this particular account, Recruitment may recommend you for another campaign if they see you as qualified. All you need to do is go and take the exams.