Refund of membership

My credit card details are loaded on playstation, a membership renewal was emailed to my 13 year old's email and not to me. R749 deducted from my account. I cannot get hold of Sony PlayStation, I have emailed, I have tried to refund the membership, followed the steps which they say you should, tried to do the chat on the web but alas, no response of email I sent and no way I can get hold of anyone. This is just not on, it says you have 14 days for a refund however, you can't get hold of anyone neither does anyone respond nor is there correct contact/email details. I asked on facebook and all the links people shared didn't allow me to get hold of anyone. I have since blocked my credit card in order for this not to happen in the future. I need assistance immediately for the refund.