Proof of payment sent yet balance still reflecting

Avon account was paid on 13815 via EasyPay. Few days after balance was still reflecting, I contacted my Sales Leader who emailed proof of payment & asked that it be investigated, a day later a response came from the credit control acknowledging proof of payment. Days later I noticed the balance still reflecting so I emailed Avon, this was a concern for me as this could affect my credit status.. To date I have had NO response, today I called to query as the balance is still reflecting only to be told that no proof of payment was sent ? How is it that the lady from the credit control thanked me for my paymet via email which I have as proof! Is it ok for them to lie forgetting that they did respond? Trying to get ahold of the lady in question is a mission as she's busy or not available, so who now is accountable for this? Absolutely disgusting & pathetic service avon, does it not matter that this could have a negative effect on my credit in future? & by the way this being due to negligence on your part!! For an international brand it is a shame that you have no standards & that your employees have no remorse. I seriously hope avon can give me answers instead of the run around.