Double debit and unprofessional service.

I signed up last year with bonitas medical aid the first payment was supposed to be on the 25th of October, after the 25th I see that no debit order went off I called to find out. The broker had put it for the 1st as opposed to the 25th so we had it changed and Octobers payment was made as an Eft. On the 25th of November my account was double debited, and December my account was also debited come January I call, the lady that assisted said to me it was a mistake on you're side and a refund is due she will sort it out and apologizes as that contribution should be moved to Januarys payment I said to her how can than be you guys mess up you don't give me a call to say why I was double debited and now you moved the cash to Januarys contribution without even informing me. I spoke to two other ladies after that including the manager and they've said to me it was a mistake if I get debited again in January I should call in. Today my account was debited I call in and the gentleman says to me I'm an advance paying member but since when because no broker discussed that with me. I'm with you guys for 5 months but have made 6 payments. This is unacceptable and very unprofessional for bonitas medical aid. You guys are ****mers and I'm going to cancel my medical aid. The debit order went off today so how would it work if my money has been taken but I've terminated the service.