The worst service ever

Checkers ferndale.The que was long so by assisting customers i was directed to the next available teller to pay my groceries. I paid my groceries the payment went through and the machine said removed card after payment. The teller receipt printer didnt work and said connection error and couldnt print a receipt. I was told to pay again for the same groceries which they told me i should get a credit on my bank which i didnt. I gave them my details. If the printer had a connection fault error it doesnt mean the payment didnt go through. The checkers staff surely dont know which process to follow but the only option was to pay again. I still didnt get a refund from checkers or the bank.