Unable to move my current memebership

In 2010 I moved to East London where I got my membership and unfortunately due to unforeseen circumstances I had to relocate with immediate effect. I contacted the person who helped me with the membership to cancel the contract and to ask about the fee. never got any response. Last year I was able to get a membership through Momentum multiply via the Medical aid. No one informed me of the outstanding amounts, to my understanding the account was closed . The medical aid currently moved from Momentum to Discovery. Which means now I need to move my virgin account from Multiply to Vitality. I called in as they informed me that I cannot move it due to outstanding amounts which were not my fault. I am annoyed and irritated as had I been informed when I initially got the membership with Momentum. This is ridiculous that they would want me to pay monies owed from 5 years ago which weren't even my fault. On top of that they want proof of communication with the consultant, I mean 5 years later I have changed numbers email and all. so where the HELL am I suppose to get that and why wasn't I informed earlier. This is gonna result in cancellation of membership which would be a damn shame. Angry