DISAPPOINTED CLIENT

I have been with edgars since 2008 and always paid my account on time, edgards sent me numerous messages saying i am in arrears, i ignored it bacause my last payment made was in August, i then received a call whereby i explained and they said my payment does not appear on the system and i need to send them the proof of payment which i did its been 6 days now since sending the proof of payment and to date nothing has been changed on my account to rectify the mistake every day i receive a call to say that i need to make payment and every time i tell them is sent through the proof of payment and not one person can help or find the proof i have sent , i am very disappointed in the service and very upset i hope this will get someone's attention , also interest was added because of this error which i refuse to pay