Avon

I was selling avon but stopped in December 2020. I phoned Avon about a week ago to close my account which they didn't. I phoned them again in this week and I was told to write a letter to close my account I wrote the letter but still haven't received any confirmation letter stating that my account is closed with Avon,whenever I phone am being told that the will be emailed to me by their credit control. I phoned again this morning as I urgently need that letter but the guy I spoke with named Maxwell told him he cannot assist me as I have to wait for credit control, I asked him to put me through to credit control and he told me he can't as they only working via email. I just need my account to be closed and a letter confirming it's closed. I don't understand why is it so difficult to close my account but they are so quick when it comes to recruiting