This is a scam. Get your card provider to stop these payments - they should already be aware of the type of thing this is.
What happens is that your account is relieved on a regular basis of a small amount of money - small enough for a lot of people not to notice. For the scammer, though, multiply this small amount by 100 or 1,000 but more likely 10,000 or 100,000 then the amount of money extracted is significant.
There is another similar scam in which small amounts are abstracted and then, finally, a very large amount. This is less popular, apparently, as the goose laying the golden egg (you) is then lost after the large amount is taken.