Unprofessional, unfriendly and double debit order for 1 membership

Gym Company maponya mall branch is debiting me twice for 1 membership. I went with banks statements and they told me they will sort it out. A month later nothing is done instead I get sms and emails that I owe. They are unfriendly and always say we will sort it out. No email, no sms no call no evidence to say they will credit my membership for the next coming months. When I ask them to cancel they tell me that I must service notice, I will serve it with the extra money. I want to cancel and start from start, I also want my R100.