Manager's bad attitude and refund refusal

I went to Ackermans mabopane to exchange tracksuits.I explained that i didi not have slip but i bought on account.The manager Frida came to me with a bad attitude telling where did i even bought them.I told her i bought them at their store.Because they were dirty and i bought them they way they were she refused to refund them telling me she can even give me customer service numbers.She dialled the numbers and told me that she gives us the numbers and we lie about them.I spoke with a male person,telling me that its going to be a loss of the company.Frida was so aggresively telling me to give her the phone and when i told that person what she was doing,he just said its not right for to do what she was doing but he didnt bother to ask to speak with her.I got so angry and told her she does not have management skills.She said i can insult her the way i want,at the end of the day she gets her salary.After a day she came to my workplace and told my manager how i insulted her but she didnt tell him what she did.She threatened to slap me when i told her i will call her empolyer's headoffice after she left my workplace.She threatened me that my employer will dismiss me for my attitude