Arrear premium collection

I am very disappointed and dissatisfied with the horrible service I have received from Old Mutual. I have had my policies for more than 12 years so I had a choice to leave this company, I would but unfortunately I would be the o e to lose all those premiums I have paid. I had a missed premium on my Greenlight policy and I have been calling Old Mutual to lodge for the missed premium since the 13th of November to date the premium has not been collected. I have been calling almost everyday but all I get is empty promises. If my policy lapses, you will pay me all those premiums I have paid for those years. I am wondering why is it so difficult to just debit the account or maybe this is intentional. Old Mutual is a very big company to render such a poor service.