Prepaid credit card issues

I deposited two days ago and my account was immediately locked. They requested documents and current card I used so I sent them what they asked for. This was no problem. They then sent an email requesting the last three credit card I used and the credit card statement showing the transactions. I told them I could not provide that because I only use prepaid visa or mastercard vanilla cards. Once you use it to deposit and there are no winnings resulting from the money then you throw it away. They are a one time use. I have told them that numerous times via email. Most Canadian credit cards do not allow deposits to international gambling sites. I have also requested that security call me to no avail. I asked in another email to either unlock the account or refund my money and again no response. They must of come across this before and I don"t understand their problem. They just keep sending emails requesting the last three credit cards and all I could provide is the one I used two nights ago and that is a prepaid mastercard as well. They have good reviews so I don't understand their problem. Please help me resolve this issue.