Not correcting my account

This will now be my second complaint about the exact same thing. I am getting very frustrated because Avon needs to fix my account as i have returned goods and they have never credited my account but yet they are quick to hand me over to ITC when they are the ones in the fault, i have been fighting about this issue for a long time and i gave up because its like talking to a broken tape recorder!!!!! they keep on repeating the same thing to me and refuse to listen why i am so upset about this whole issue, i have dealt with everyone possible and everytime i ask for the manager i wait on the line for more than an hour anbd never actually get to speak to the manager so obviously im not the only one complaining! I am getting very frustrated by getting threatening messages and getting bothered at work!