Some guy owes me £200 and he isn't paying up

[modz]

For short context, I sold this guy 2 pairs of shoes and did a refund for him and he owes me £200 and he has not paid me a single cent. I know who he is in person and I know his address (15 mins away from my house) and know his email:password ( he uses the same password for pretty much everything).

Do you guys have any suggestions I can do to fuck him over without him finding out it is me?