billing me for Products i did not receive

recieved an order from avon with 2 bags valued at R358 missing, i called avon the next day and they said the bags will be sent to me as soon as possible. i received the bags within 5 days. however avon has charged me again for those bags which i had been charged for already, i called my sales leader and she said she rectified it, however avon is still smsin me telling me that i owe them R358. i have called avon more than 10 times but still the issue has not been resolved, they keep sending me back and forth. the invoice number is ***9 and order number ***. i really really need this to be resolved as soon as possible, coz this is not the first time it has happened the last time i ended up paying R168 for things i never received.