You try...

You follow best practice...

I brought a manly shredder,

a cross-cut beast of a shredder - to safeguard my identity;

to prevent fraud.

I regularly change my PC passwords,

complex fourteen character passwords - a b***h to type;

to prevent hackers.

I use anti-virus software,

market leading Anti-Virus software - with built-in firewall;

to prevent infection

I shield my PIN,

my cashpoint PIN, when getting money from the wall;

to prevent sly watchers.

I got paid for a job, a complex job, in cash.

I got mugged.

S**t.

Author's Note

Written for a prompt "Annoying"