Only your college can give a definitive answer. You are a bit vague about your previous A level studies, if you only took AS exams and did not enroll for the A2 course, then technically you haven't attempted a level 3 course. If however you did take your A2 exams, you have already completed a level 3 course. But then there are exceptions for 19-24 year old funding, so your previous level 3 studies may not count, if you did not complete them. But this may depend on your college.
You don't say whether you are on Job Seekers Allowance Contibution or Income based. Most colleges I have looked at, only give concessions for Income based version of Job Seekers Allowance.
There may be a different levels of fee concessions available, depending on your circumstances. If illness forced you to withdraw from your previous studies, the college may exercise discretion on what fees are due.
If you can't get through on the phone, try going in person.