annoying scam

Caller: Credit Corp

Still chasing me after 5 years on behalf of Optus for an apparant outstanding bill on a business account. For the total amount of...... wait for it.... $7.62!!!
I didn't owe it but last year I told them I'd go halves with them to get rid of them. I paid $3.81 so I guess they're still looking for the remaining $3.81. I decided I'd paid my share and not take their calls, any of the 3-6 per day including weekends. Today they actually called an ex employee looking for me..... They must've gone through the phone records and picked the one most dialled. Unbelievable...... Today I am angry and tomorrow they'll be hearing from me with regards to harassment. They also don't call until I have looked at my phone after waking. If that's 7am they've called by 7.15am, if it's 10am they've called by 10.15. Ironic how they can tell when I'm asleep, even with shift work

I called back number (02) 8651 5262 reached voice mail but did not say for what company.