Do you have to pay back your Advanced Learner Loan if your on benefits?

Ive taken out 2 advanced learner loans. The first time I did not complete the course and left early, the second one I did complete the course. I'm assuming my second loan will get wiped off when I complete my undergraduate but I'm guessing the first one won't as I did leave the course early? Thats my first question.

Second question: I am being HOUNDED by my college to pay back that first loan, they are harassing me non stop and are very manipulative and told me I probably wouldn't be able to do this course because I didn't pay the first loan back - spoiler - I did get to complete this course they were trying to pressure me.

Now as far as I know, being on benefits mean you do not have to pay back the loan, even if you left the course early? I've been on benefits for a couple years now and I did pay the loan at first but I received a letter telling me that I no longer had to pay it back since I was on benefits and I'm pretty sure that was either from student finance or the college themselves but I cannot find that letter anywhere. Can someone confirm for me, or point me in the direction of a source that confirms I do not have to pay the loan back until I'm in employment? because they're threatening debt collectors now and I'm starting to get nervous.