Avon No delivery

i am an Avon sales representative and i have lately been receiving terrible service from them they say i have a credit limit but every month when i order they refuse to release my order due to an unpaid balance so I've never used my credit limit and every time i receive my order something is damaged and i have to send it back then i get told they have no record of this getting sent back, i placed an order after three months and i paid an amount of R1000 to them but i forgot to put my account number as my reference number and i phoned Avon credit control and told them they say no just email the proof of payment with my account umber which i did and they still weren't releasing my order and then I phoned again and then they said i must send it again which i have and now today after three weeks they still haven't released my order due to an outstanding balance which i have paid for but they keep on saying i owe it to them meantime they haven't credited me for things i sent back that were damaged. i asked to speak to top management and held on the line for an hour this is ridiculous.