I was in similar boat number of years ago. I wrote to Revenue outlined clearly the situation, copy of the tax paid docket and receipt, and requested that I remain as a PAYE worker. it took a few bits of correspondence back and forth with them requesting more info (60s for a number of years, etc) but it got sorted. suggest you do the same AND KEEP COPIES OF YOUR CORRESONDENCE, cos Revenue are great for loosing stuff or the person assigned to your case goes on hols or is out sick and it sits in a big pile of unprocessed documentation.