Not refunding my money after incorrect payment made

<p>I made an incorrect payment into their account and notified them immediately. I was first told it would take 3-5 days to be refunded, then 21 working days, then up to 60 days. I am now communicating with "Management" who do not respond to my emails and conveniently drop my calls. This is infuriating and totally unprofessional, possible *******.</p>