Debit order without my authorisation

I spoke to the call centre consultant about the policy. I gave her my information including my bank details. She told me I will have to authorise the debit order before they deduct money from my account. I ddnt authorise it but they deducted twice. Now I want my money back..i have been trying to call them but I get cut off before I can even speak becouse I don't have enough airtime. I sent email but they don't respond. I used tweeter to get their attention still they do not respond. I also used Facebook. Please help me. My ID number is ***