Disgusted by OMSMAF

I have had staff medical aid with Old Mutual for about 4 year, paying R2300. Today I called in for authorization to go see a doctor. They did security check questions and I passed all except for cell number registered as I registered it 4 years ago. They say they won't help me because I don't know a cell phone number from 4 years back yet they are still benefiting from my hard earned money. I'm disgusted.