Disrespecting customers, poor customer service

I bought menstruation underwater at Ackermans wonderpark on 30/09/2024 and the next day I washed it before it will be worn when I check them on the 2nd of October 2024 I realized that on the stitches there is long threads that is loose it looks like when times goes on the stitches on back of underwear will be torn so I went to Ackermans I find the lady at the door she said to me it won't be possible to refund or exchanged as you went out with it and you have washed just take a scissor and cut it off and I said it won't be possible I proceed to the tills whe I got there I found a cashier told me it won't be possible I said why the answer from him said because you did washed it I ask him why shouldn't I washed first before I will be wearing it he said if you want to returned it if it's factory fault and he call the manager said he can't exchanged it to ke because I have already out of the store and I bought it on the 30/09/24 and I also washed and he asked I really no my size if I take a wrong size he won't be able to changed it .I told him that you think I don't know my size of underwear and I am not here for sizes I am for factory fault that stitches are not proper sewed by machine as thred is hanging around the underwear the manager said I won't be able to changed it you can call customer service he said my name is Benny Makhubela I ask him a question you mean if I bought underwear I should inspect it before I left the store he said yes I said it means Ackermans you are selling things that are not quality