RE:DONT NEED THE TEXT MESSAGE COSTING ME KSH15 CREDITTOPUP.

I RESENTLY RECIEVED AN ADVATISMENT ONLINE WEBSITE  FOR A NOKIA PHONE FOR FREE AND I APPLIED AND SINCE THEN THEY HAVE BEEN CHARGING ME KSH15 OF WHICH I WANT IT TO BE STOPED WITH EMIDIATE EFFECT THE PIN CODE THEY GAVE ME WAS 3876 MESSAGE CENTER FROM4475 PLZ HELP STOP THIS TEXT COZ THEY ARE COSTING ME.