REFUSAL TO UPGRADE MEDICAL AID.

I am a loyal Discovery Client, My car insurance is with them , My content insurance and insurance on specified items and then I am on there Vitality plan and medical aid. I have been trying for the past month to upgrade my discovery medical aid plan from Essential Saver to Classic Saver. Unfortunately i called them from a private number. So i cannot "Prove" I tried calling them. If they listen to my conversations they will know that in december me and my fiance was ****** in the middle of the night i dont have proof that i called Discovery I do have a SAPS case number to prove my phone was ****** but it is not proof enough. I find it extremely rude that i call and then the phone gets dropped. Then when i finally get through to a call taker, I am refused the upgrade because I am 5 days late. Discovery I expect some sort of fixing this UPGRADE MY MEDICAL AID must i beg you to take my money