MTN 100% DATA BONUS

This has been on for a while now. It's been working without any difficulty and all sims are eligible. All you have to do is send the following text messages simultaneously:
DOUBLE to 131
PROMO to 131
FREE to 131
You will receive the following messages:
"Your request has been received"
"You have sent an invalid command"
"Dear customer, enjoy data offers on mtn deal zone, dial *131*1# and enjoy double data bonus".
To check you data balance dial *131*4#.