I called back number 0490 290 858 reached voice mail but did not say for what company.

This is a call from a charity looking to raise fund and gain supporters. I do not know which charity, but this is what the voicemail advises the call was from.

I called back and the voicemail advises that it is a call from a charity that I had once supported in the past. It is a call to ask if you would like to donate to a charity.

Caller: Unknown

Keeps calling late from 6pm-7pm and not leaving a voicemail.