Planet Fitness Money **** ??????

I was a member at Planet Fitness Centurion. After a amount of R1722.30 was paid on12/01/2016 I cancelled my membership. However I was still using the facility but with no contract I paid on a monthly basis. After all these years I received a e-mail on the 24th May2018 from SAYA-Recoveries that I owe Planet Fitness R7004.60. Can you help me please. Regards Arthur de la Rey