can i have some more money,that car i sold you 10 month's ago,i undercharged

[Who are you]

you,you owe me £1500,send? ME THE MONEY ASAP,if you don't have the cash then give it to me weekly,okay.
http://uk.news.yahoo.com/4/20100904/tuk-six-million-face-tax-shocker-dba1618.html