Please help communication

I purchased some thing at a retailer for $120 my money. My mom works there with her discount we paid $120 price originally was $150. I paid the whole amount. Now the item does not work I asked her to return it. She will not return it keeps postponing, I want my $100 it will be in store credit. She has offered to pay me $100 for the in store credit. I want to purchase a crib online, I asked her for her discount she said no because she will pay for it after talking she said okay she will Buy me the crib this stupid bitch is thinking that she's buying it I said okay you dumb whore give me the dam $100 and pay the crib yourself mother Teresa. Oh no I mean I'll pay the taxes four dollars I know you won't pay. She insults who I am because I always pay on time and she insults herself its five dollars of taxes and a discount for her daughter and grandchild what's wrong with her how do I tell her? Should I go to the store return the product pay for it myself lol she will still be delusional and say that she paid for it wth do I do the lady is driving me nuts. So now you have to beg some one for a discount what's life becoming your family do the right thing.