Refusal of payment

I worked for Medscheme in Cape Town and resigned on 29/01/2016. Their pension funds are being handled by Old Mutual. Medsceme sent my documents to old mutual on 05/02/2016 and was suppose to make payment within 6 weeks, up to now they have not paid me. Every time I phone them the call centre agent tells me that the payment have not been processed because there was an error on their side and they promise to escalate the issue but they have not done that. I have spoken to more than 3 agents and they are all telling the same thing and promise to escalate the issue butnone of them have done that. I have been waiting for almost 3 months now and every time I phone them they lie to me. I am a student, unemployed and want to pay my school fees but old mutual does not want to pay me. They want to expell me at school because I owe school fees. Please help.