Disgusting Behavior From Kim - Manager

Dealt with the top manager named Kim, was very unprofessional in her conduct, the company sends multiple invoices which was very confusing, they contact me 2 months later to tell me that there is an outstanding balance, I asked for help to investigate the matter and Kim told me the invoice number that was outstanding, her tone was very unfriendly and confrontational, if I did not understand something she would say buty I have told you 10 times already and had no patience, she would constantly speak over me and I found it difficult to get any questions in. I have never experienced such an unprofessional attitude, when sending items with this courier service over a period of 2 months our products were destroyed, and it was also a battle to get the courier service to take responsibility for this, I am using another service now even though I pay extra, but I will not support such disgusting behavior and being treated in such a threatening manner.