6 months and still no one has assisted

I have never been so annoyed in my life, for 6 months I have been trying to update my email and cellphone number. I was a member of Discovery Vitality more than 10 years ago, so when I wanted to join Vitality Open I tried to register. It said I am already a member. I cannot reset my password or find my username because they are under an old email address and cellphone number. I eventually got through to the call center. I updated my details telephonically, and was assured it was done. Low and behold, its not. Can someone competent do this change, so I can join the Vitality Open, or do I need to wait a further 6 moths for anyone to respond to my request or assist me