IS MTN MUSIC PLUS CHEAT BLOCKED ?

This is the message i received from mtn today if i
send CANCEL7D to 5900 =Your request has been
submitted. Effective on 2015-12-30. Click http://
m.mtnnow.com/?c=9 to enjoy the music before
expiry; SMS 7a to 5900 to subscribe later on
And if I send D to 5900 it says I have already
subscribe