CANNOT REPAIR OR REPLACE PHONE

HI THERE, I BOUGHT A SAMSUNG PHONE FROM ACKERMANS ABOUT TWO MONTHS AGO FOR MY DAUGHTER WE KNOW EXPERIENCE PROBLEMS WITH THE PHONE IT KEEPS ON FREEZING TOOK IT BACK TO OVERLOOK THE PROBLEM WE WERE TOLD THAT THEY CANT ASSIST US DUE THAT I DO NOT HAVE THE PROOF OF PURCHASE AND I HAVE EXPLAINED TO THEM THAT I HAVE MISPLACED THE RECEIPT AND THAT THE PHONE WAS BOUGHT ON CREDIT THAT THE CAN ALWAYS LOOK IT UP ON THE SYSTEM BUT THEY REFUSE PLEASE ASSIST CAUSE I'M ABOUT TO LOSE IT ABOUT THE BAD SERVICE WE RECEIVED WE ARE NOT IMPRESSED