Refusal to release our funds

My husband cancelled his membership with Momentum on the 1st of January. 6 months later we have still not had the balance of his savings account transferred to our new medical aid scheme, despite numerous emails, phone calls and reference numbers from Momentum promising that it will be done. I am horrified when I see that other people are also complaining about the same problem ... Momentum has just been rude and unhelpful and we are so frustrated. I cannot seem to get a service consultant to transfer me to a complaints department or a manager/supervisor. If I do not get this resolved I will definitely take it further as I feel that it is ********** for them to keep OUR money in their account, earning interest for them, not us, for over 6 months. I am disgusted.