How can I deactivate my line from mtn xtratime

Mtn are wicked
They will not allow u to cancel it or call them

Y'ello! Your account has been credited with 2.7GB+2mins (valid for 30 days). NGN 2300.00 (includes VAT) will be deducted from your next recharge.

Dial *13099# and grow faith with Christian & Islamic content

I receive this and I don't want it I didn't subscribe for this why would you be borrowing me this is the 3rd time and I'm forced to pay back