Shocking service

I went to Capitec bank to get my new card as my card expired in the 11 month 2025. I was issued a new card and assumed all was ok till the next expiration date. I pulled into a service station to fill my cars fuel tank. Lo and behold when it came to pay my card showed invalid pin. I had to the return to the bank to find out how the heck my pin had changed as I hadnt changed it. They then apparently rectified the situation and then had the cheek and the audacity to charge me for doing it when as I said I hadnt changed the pin so can inly assume the person who gave me the new card changed the pin without informing me