Disappointed with Discovery health customer service

On 16 August 2019 I was contacted by Daniel Stapleton a discovery health consultant for membership for myself and my son. We completed the application online. Afterwards my membership documents was sent to me where I noticed my son's date of birth as well as my address was incorrect. I immediately responded to the email to notify them of the mistakes with corrections and on 21 August they confirmed that the address was fixed but in order for them to amend the date of birth they require a copy of my son's birth certificate, I agreed and sent the copy. My membership commenced on 1st October 2019 upon receipt of my card I noticed that the address was obviously corrected but not my son's date of birth. I contacted them in October 2019 to query this and was told that it will be updated then a new card will be issued. In November I noticed on the App that the details remained unchanged phoned again and was assured that the change will be made and a new membership card would follow. I received the new membership card. But nothing changed. I phoned again on 03 December and was asked to forward my son's birth certificate yet again, which I did sent again. The email requests to give turnaround time of 2 to 3 working days for request to be processed. I have till date not received any feedback. I find this extremely frustrating.