Gym Company a waste of time

They are a complete WASTE of time! They keep taking my payment for someone else then tell me I HAVE NOT PAID! THE ACCOUNTS DEPT IS A COMPLETE STUFF UP! I HAVE BEEN DIAGNOSED WITH GRADE 3 KIDNEY CANCER, BUT I STILL PAY RELIGIOUSLY AND THEN THEY HAVE THE AUDACITY TO TELL ME I DON’T PAY! The manager is ‘Lucky’ but I will be lucky if he calls me back.