No service

A few months ago my monthly contribution returned on my bank account. I called the client care and was told that on their side it shows my bank account is closed and that they can no longer debit it. I was told to complete a form and send it back to change my account debited to my saving and was told that I wouldn't have cover for the coming month unless I made arrangements.

I sent the form with a request to double debit my account and asked for confirmation. All I got was confirmation that my bank details have been successfully changed. I call and get told that my membership is suspended for the new month even though i asked for a double debit. Anyway I left it that was for May month. June my debit order goes off for July and then next thing I get an email saying my membership is suspended. I emailed the team proof that payment went off my account no reply. On the 27th of July my debit order went off for this month and i received an email on the 31st saying that my membership is once again suspended due to none payment. Now i ask you what the hell is going on there??????? Again i sent through proof that the debit order went off. What if something happens to me and i get turned away by a hospital because my medical aid is suspended yet payment goes off, who do I sue?