Unconsented gym membership

I have an issue with planet fitness ,who is debiting a gym membership fee that I did not consent to ,I went to the gym to enquire about packages and they asked for my details to see if I was eligible,I communicated with the lady who was assisting me that I am not interested in a membership but got home to a notification for a debit order .I returned to them and they advised me to ho through customer service,I have proof of the conversation with the lady that I am not interested in a membership but they are constantly debiting me and I have been trying to get assistance but they are not interested in assisting me. Sanele who I believe is one of the managers just took this situation as a joke and turned his attention to my friend whom I was with to get her number to get her to join.I am livid and frustrated