SABC refuse access to management to assist in refunding R7500 accidently paid into their account

I NEED HELP! I paid R**** into SABC's account - by accident. I immediately went to Nedbank requesting a recall on the amount. They advised they cannot do this with a public company. I then email SABS early yesterday morning. I did not receive an advisory that they are in receipt of my email and a consultant will make contact. Nothing. No one has responded. I called customer services this morning who confirmed they have my money. Told me it will take around 5 weeks for a refund. I refuse to accept. Asked for management or finance department. Advised that they do not receive calls. I must email them. Advised I have already done so. They shrugged and said they can do nothing more. I must wait and 'hopefully' someone will come back to me in 72 hours. They confirmed that the only way I can access any human in SABC is only via email or customer services. One sweet man suggested I go throw a tantrum at one of the head offices . Has anyone got any suggestions/contact/means I can escalate this? I will not accept that they will hold onto my money for over a month disregarding what it means in terms of how it affects us at home.