Bad customer service

I recently made a lay bye at the store and once I paid up my lay bye on collection of goods I realised the sizes were small so I had to exchange the goods well they made me wait for over an hour just for the transaction to be authorised..I went back to the store after one day to exchange more of the goods I bought and needed a copy of my slip as they gave me a photocopy and I wanted to exchange the goods at a different branch,I gave them the time and date of my last purchase but still I waited for a good one hour and 30 minutes..they went on with their sales and just left me there untill I confronted one of the tellers they didnt even bother to apologize or explain the delay instead they gave me a bad attitude..ive never been so ****ed over customer service like this before dont think ll ever go there again.