Pick n pay owe me money and they dont want to pay me

I went to pick n pay Thavhani Mall to buy food and the cost me R350, i used my card n they swiped my card and i got a notification to say that money is deducted for grocery . The cashier said she cannot give me grocery because the card did not go through she called a lady called The supervisor and they requested my bank statement to proof of which i gave them . They told me that it will be refunded. I waited and nothing , i went to them again using my own money for taxi about 4 times. I called the store manager he said i must come today , when i get to te store he was not there n my issue still was not resolved. They said they cant trace it. But bank statement is there to proove that i paid. No grocery and no money in the account i went home with nothing. Even today nothing was paid. Its close to a month now. Everyone in the branch seems to know my story because when i get to the branch they will say you havent got ur money? Now pick n pay is running their business and they dont care that i ddnt get my grocery and the money. M tired of going to the store but i come back with nothing they will just say we will call you but no one will call only wen i call them they say come to the store but when i get there nothing will happen . Wasted money for transport daily 38 rand by 4 . For nothing. Still no money is refunded. My 350 just went to pick n pay for nothing . Just for them to profit.