Ridiculous Service

I received a whatsapp message from David Planet Fitness Greenstone whom I gave my details and paid R180 promotion registration fee. I was then send a mandate to approve my debit order which I declined because I don't get paid on the 25th and I communicated that with David. My account is now being debited a joining fee amount of R689 and R287 monthly fee which I keep reversing with my bank. Planet fitness Greenstone please stop debiting my account. I did not sign any contract with you, I did not authorize your debit order mandate and I don't get paid on the 25th. I am going to demand that you pay back all the bank charges for the unpaid and reversals already occurred in my account.