MTN I need help from you

EVERY day I receive a text from MTN... If it is not YoYo its MoMo or it Yello or whatever nonsense the marketing department can conjour up. I have written to the client liaison department without any response. And I have called them - 30 minutes before I put the phone down. No luck. When i did finally experience the good furtune of making contact with someone, his advice to me did NOT work.