*******ly signed up for MTN Play. Not even an MTN customer...

I received an SMS on Saturday 8 September at 23:05 saying "Yello! We could not bill you for the MTN Play service. (Dial *123*7# to subscribe to our Latest Subscriptions)" I'm not an MTN customer. The number used to be MTN but I ported to Cell C about a year ago because MTN was *****ing my airtime. I also never signed up for MTN Play services, even when the number was MTN. I feel sorry for your actual customers who have to deal with ********** billing like this, as I did not receive any notifications I had been signed up for any services from MTN. I also had a similar issue on my other number, which had NEVER been an MTN number, a couple of months ago. Please remove my number from any of your advertising lists, subscription services, or anything else to do with MTN. Thank you.