PATHETIC SERVICE DISCOVERY CARD

I have for weeks now again been calling Discovery to change my contact number so that i can use my Discovery miles , so that the OTP can be sent to my new number , i have answered all the relevant security questions and the person on the other side advised me that the contact details have been changed , only to find that it still has not been changed when i tried to purchase something with my Discovery miles I then called again and again only be be shoved from pillar to post the consultant at card Division advised that she could see a complaint was logged last year she will now change the number she then advised that she will ask technical to amend the cell number where the one time password goes to and it will take 48 hours .... 48 hours have come and gone and still when i tried to purchase something again nothing happens as the OTP goes to my old number !!! why must this be such a frustration ive been shoved from pillar to post and i am very frustrated with the level of service that I have received which needless to say is shocking and poor!!! when I log onto my profile i can see that NOTHING absolutely NOTHING has been done!!! SHOCKING SERVICE !!! this complaint is going back to Last year OCTOBER!