I was hoping to give you some information about the company sending these messages, so I have checked this number against a database we have of these types of numbers but this one is currently not listed.
As long as you've text the message 'STOP' you should be ok.
Have you received any more text messages from this number since you sent the message to stop?
I've just had a text this afternoon, first one as far as I can see. It says to text STOP to 64546 it's Jamster Tone club. £4.50 per week. For help it says ring 02071369911 I've just text stop to the number given and received confirmation that the subscription has been terminated.