Disrespect from Checkers Supervisor and Manager

My dad bought twin saver toilet roll on late Friday. When he arrived home my mom already bought from Clicks on special. He was unable to return them during the weekend , my mom went on Monday 27 July 2020 she recieved a bad service from the supervisor and manager questioning the colour of receipt accusing her it's only their staff that use pink receipts. My mom called my dad to find out if he asked a Checkers staff member to pay for he said no he paid himself they still refused and said they wont take it back because of the receipts they were very rude to her. She is very disgusted by your staff it's not a customer's fault if they were given a pink receipt or white receipt!!!!