"I wouldn't have requested a refund if I would have heard back from you. I saw on your previous ... " (more)feedback that you had to leave the site for a little bit for personal issues, and figured something similar had happened when you never responded."
"Hey, no worries. I understand. If I had known you were going to come back, I wouldn't have requ ... " (more)ested a refund. I only did because I thought something major happened that would prevent you from ever returning to the site."