Premium deducted without knowledge.

I was on a Premium Business trial period which ended. After trying to collect subscription from my account a few times and being unsuccessful; I received an email from LinkedIn saying that they can't renew my subscription so my premium is declined. But today they deducted R6000 from my account without any warning! I did not agree to this and it is impossible to contact them! I want my money back please! I am a single mother of 3 and that is my money to survive the month. Has anyone else experienced this and did you get your money back????