No service - Momentum

Good day, this is Chantel. Just want to share my unacceptable experience with the Call centre of momentum. Last month my retirement anuity premuim went off the beginning of the month and then out of the blue again on the 23rd. So the morning of the 24th I phoned the call centre and query the dubble premuim that went off after years of being with momentum. They said that they will logged a complaint and phone me back. Nobody gave feedback. Then I phoned again and begged the call centre agent to follow up and phone me back. Once again no body respond. I phoned several times and just no service at all. Yesterday morning my premuim went off again....TWICE...the same date. I phoned again... Very unpatient and requested to speak to a manager because of no service and feedback. The agent put me on hold for approximately 20 min. I then also phoned from the landline while I was put on hold on the other line just to try and get some assistance. Once again the agent put me on hold for another 10 minutes. The agent of the first call then said I can speak to a manager. She said she will follow up and if she isnt available someone else will definitely phone me back. I asked her specifically to phone me back after the poor service. Once again nobody responded yesterday. Momentum is *****ing my money and I just dont get any service or indication of why this is hapening. Any advice on what to do or to solve this matter to get my money back. PLEASE I DESPERATLY NEED HELP AND ADVICE?????