Unknown debit order

I noticed a debit order of R99.99 reference is RF***3SMart2745 from Mediplus of which i know nothing about and the 2nd one is from BEEZO ref number RF***5BEEZO23621 same amount. I received the notification with sms, i am just tired of the ***** that is happening on my account, how in the world did they get hold of my banking details? i want the refund and the bank charges to be paid on my account, really if this site was not there people or other companies where going to take an advantage of people, this is not for the 1st time this is happening, Im really ****ed off with this whole thing.