Poor customer service

I am so frustrated with Old Mutual. I took a policy many years ago for a GreenLight. Money was deducted from my payslip through stop order. I changed employment in October 2023. I made several efforts to inform Old mutual through their call center, email, whatsapp and even visited one of its branch Sunnyside. I provided my bank statement and payslip. The lady took the documents and scanned them and promised that all is sorted. Yesterday I received an email stating that i missed a premium. I called twice on 03 November following up with no success. Now i am being told that Greenlight changed the system. So o should wait for 5 days,then rheu change the story saying I should send them my bank statement proving that I had funds in my account. I am so tired of all this and need Old Mutual to give me rhw service they promised to give me. The call ref no is Neziwe16h382023 November 03. She said she is unable to see any information on the system. I need Old mutual to resolve this.