Possible ********** action

Be aware: recently I visited Rocklands KFC in Mitchell's Plain. I paid with a R50 and got my correct change. I also received the correct order. Nevertheless when I checked my tillslip I saw that the amount of the order was swiped. It didn't say I payed cash and it didn't reflect the amount of change I must get. What happened? Could this be the result of ********** action? I sent an email to KFC who didn't respond at all. Consumers please beware.