Builders warehouse Bedworthpark has ****** my pensioner father of his hard earned cash

My dad made a purchase for the amount R1616 on the 9/12/2021. I returned some of the items the next day to the value of R895. Instead of being refunded he was the debited again on his credit card. On the 11/12/2021 he queried this issue with a man by the name of Prince Ndlovu and he told my dad to send all required documents of the purchase. My dad sent all the documents and thereafter was told that the turn around time for his query to be resolve was 48 hours. 48 hours later he called in again an spoke to a very rude lady who told my dad that she doesn't know what he is talking about after explaining himself several times. The lady hung up on us. We called in again and we were told that we have to now follow a different process to the one we were initially told. this is really not fair as my father is a pensioner who is using his pension money to make a living and the a big business like Builders wants to rip him off and rob him of his hard earned cash. ***