Funds@work service complaint

My name is Xolani Kambule ***, I have had a horrible time with Momentum Funds@work consultants not assisting, dropping and muting my calls for over 20 minutes. I have logged a request to withdraw my funds since I have resigned from my a previous employer however I have not received received any feedback from Momentum or any of their consultants very disappointing. Please assist me with escalating this to the relevant ombudsman. ***.