Not satisfied with the service im getting from Old Mutual

Good day, I have a complain in regards with Old mutual as i have a group comprehensive cover with them. Last year i received a call from them saying I'm behind and when i went to old mutual offices everything of mine is up to date. This afternoon again i received from them on this number *** and this guy saying i owe 1 month from June 2023 and he is saying the amount that I'm currently paying this year. How is it possible for the amount was paying in 2023 to be the same amount that I'm paying this year. I checked my bank statement and it shows that on the 30th of June 2023 they did deduct. I asked the guy who called if this was behind in 2023 why they call me now, after a year and few months and more over what is upsetting me, he said they will put my contract for 3 months before it lapse if i don't pay for that month.The guy said he will send sms for reference number of the call, I'm still waiting for it. I dont want to lie I'm so irate right now as I've been with them since 2017 and suddenly now they do this.If its the way to eat peoples money will take them to the lawyers now because this i keep on getting such calls now.