Linked In Premium ****!

On Linked In I received a 30 day trial for Premium, at the end of 30 days my account was debited an amount of R6899,86 without me signing up for this Premium Linked In offer. I have been trying to get my refund back to no avail, even my bank can’t refund me that money because Linked In set it up as a subscription and not a debit. This is really a ****, I am really disappointed by this from Linked In. I have tried to explain to them so they could cancel this subscription and refund my money back and they simply refused to refund my money back!