I have just dealt with this situation. The automated system does not work. Use the 800-416-6129 number to take to someone to cancel. This is such crap for this company to be able to steal from people like this.

I emailed this site and here's what I heard back:


Thank you for your recent email to Mobile Content Customer Care. Our staff will assist you within 48 hours. You can also contact us directly on the following free call numbers or email addresses:
USA:
Email: [email protected]
Phone: 1 800 416 6129 (live operator)
1800 235 7105 for automated help
Fax: 1 310 496 2873
If you have provided your cell phone number in your original email our customer care team will quickly process your request. If not, please reply to this email with your cell phone number.
You may also cancel this service at anytime by replying with the word STOP to any text message you have received. This is a standard policy for all numbers offering mobile phone content.
Please see the explanation of services below as it may answer some of your questions.
In order to receive text messages, content or charges to your mobile phone bill one of the following must have occurred;
o 1. Visit a website offering mobile content.
o 2. Enter your mobile phone number online
o 3. Receive a pin and enter that pin online;
o 4. Or, send a text message to a premium number you have seen on TV or in a magazine.
Please remember, if you have requested to be contacted, you will be hearing from one of our representatives within 48 hours.
Sincerely,
Mobile Content Customer Care

I had this charge on my ATT bill. I too have never authorized this or answered a text that would have started this. I am certain of this. Called ATT, they are able to go back 60 days and refund. I have been charged for this for 7 months, and never realized it.
I looked on this site and saw message above. I called 800-416-6129. The guy told me I had reached the mobile help desk for Mobile Messenger. He needed the 5digit ID next to my charge on bill. He found the "subscription". He said he could refund 3 months now, or I could fax in bill to 310-496-2873 and they would refund ALL charges. Refund comes in form of a check, gave me confirmaton number. I went ahead and just took the 3 months refund from him, plus the 2 months credit ATT will put on my bill. I didnt want to mess with faxing the copies of my bill. So, its a mess, but at least I am able to get a refund. Now that I think about it, I could have faxed my bill, received the 7 months refund AND the ATT credit, and end up making money off them...but, karma...