Oldmutual ****** ****mers

I opened educational plan last year August for my 4 years old son, it's not reflecting on my app but other policy are reflecting except this 1, when I call oldmutual they told me that it's not under my name but under my son's name. I emailed them to fix this issue as is not my fault, but they told me that they can't fix this as they use different contact number, I don't even know whose contact number is it that they used on my son.