Afrihost warning me for reversing an error double billed amount!!!!!

I was double billed by Afrihost after I was told I wont be. I was then told by the accounts department that it was a mistake and that i must reverse it myself, which I did, which also cost me R40. I now got a warning email and SMS stating that the double billed amount was unsuccessful and I have 15 days to pay it. REALLY????

SORT THIS OUT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!