I didn't answer, went to message bank and the female voice repeated hello about 4 / 5 times and then said I haven't received a response. I shall call back later.

I called back number 0415 662 318 spoke to a woman but did not say for what company.

Caller: 0415 662 318

I answered a call from this number and since then my phone has been tapped and calls no longer work and emails acceessed

I answered this number 0415 662 318 but wouldn't respond back .
I see someone has posted debt collector from Telstra . I do direct credit so I know I don't owe anything

I called back number 0415 662 318 spoke to a woman who said I've reached Impact Financial Services.

Caller: 0415 662 318

Impact financial. They are a debt collector for Telstra

It's people on behalf of Telstra

I called back number 0415 662 318 spoke to a woman who said company name is Impact.