You should contact SFE regarding repayments to them. Masters degree loans are not tuition fee loans or maintenance loans specifically, you just get the loan to spend on either and/or both. As you've dropped out early in the course you will need to repay the majority of the loan amount you have been paid. If you aren't able to do this immediately you will need to discuss a payment plan with SFE - I gather they are usually receptive to such requests.
In terms of uni fee liability, usually if you leave the course very early on (in the first week or two) you don't pay the fees (or the whole fee). There is usually a set cut off date for this so you should find out from your uni what if anything you need to pay in terms of fees. I would strongly recommend you speak with your personal tutor about dropping out and what the requirements to do so are and what your fee liability is.